This is the sliding base ONLY. It is not a complete fifth wheel hitch: it has no coupler head, so it cannot hold a king pin and cannot tow anything on its own. The complete hitch is B&W RVK3670, which is this base plus the RVC3006 coupler head. B&W sells it as a service part, so this is the listing to use when a base has been damaged, when you are moving a coupler head to a different truck that needs a different base, or when you already own a RVC3006 head. It mounts to the four pucks of Ram's factory fifth wheel prep package exactly as it does in the complete hitch, and it carries the 20,000 lb rating that gives RVK3670 its number.
What's Included:
Sliding fifth wheel base for RVK3670
Pins, hairpins and base mounting hardware
Features
Component Part, Not a Complete Hitch This is the sliding base ONLY. It is not a complete fifth wheel hitch: it has no coupler head, so it cannot hold a king pin and cannot tow anything on its own. The complete hitch is B&W RVK3670, which is this base plus the RVC3006 coupler head. If you need a hitch rather than a spare base, RVK3670 is the part number.
The Half That Sets the Rating On a Companion or Patriot the coupler head is shared across models and the base is what changes, which is why B&W can sell 20K and 25K hitches that look the same. This base is the 20,000 lb half of RVK3670, and it is rated for 20,000 lb gross trailer weight with 5,000 lb vertical pin weight once the RVC3006 head is on it. Those are the hitch's numbers. What you can actually tow is the lowest of the hitch rating, your truck's own fifth wheel rating on the door jamb, and, on a rail-mounted hitch, the rails underneath it.
Mounts Exactly as It Does in the Kit It attaches to the four pucks of Ram's factory fifth wheel prep package, the same way the base in a complete RVK3670 does, and it uses the same installation sheet.
12" of Slide This is the sliding base, with 12" of locked travel for tight turns on a short-bed truck. Its box weight is the giveaway: sliding bases in this family run 171 lb to 230 lb where fixed bases run 78 lb to 96 lb.
Steel and Powder Coat Powder-coated steel, the same finish as the complete hitch. Made in the USA, built by B&W in Humboldt, Kansas.
Fitment & Compatibility
Requirement
Detail
Complete hitch
● RVK3670. This base is one of its two halves; the other is the RVC3006 coupler head
Truck
● Ram equipped with the factory fifth wheel and gooseneck prep package
Attachment
● Four factory bed pucks. The base drops in, the handles turn, the pins go in
Rails
✗ Not used. Nothing is bolted through the bed floor
Bed when not towing
● Flat, with the four factory pucks flush in the floor
Without the prep package
✗ Not compatible. A Ram with no pucks needs rails or a B&W Turnoverball under-bed system
Fit guidance: This base fits the same trucks as the complete RVK3670 hitch. This hitch mounts to Ram's factory fifth wheel prep package and fits only a truck that has the four pucks in the bed. Ram's puck system also has adjustment in it that owners frequently miss, and a base that feels loose in the pucks is usually the adjustment rather than the hitch; there is a B&W film covering exactly that in the videos. Those are the hitch's numbers. What you can actually tow is the lowest of the hitch rating, your truck's own fifth wheel rating on the door jamb, and, on a rail-mounted hitch, the rails underneath it.
Specifications
B&W Part Number: RVB3670
Type: Fifth wheel hitch sliding base, component part
Coupler Head Included: No
Complete Hitch: RVK3670 (this base plus the RVC3006 coupler head)
Rating in the Complete Hitch: 20,000 lb GTW, 5,000 lb vertical pin weight
Type: Mounts to the four pucks of Ram's factory fifth wheel prep package, exactly as the base in a complete RVK3670 · Time: About 15 to 30 minutes · Tools: Minimal; a second person for the lift · Difficulty: Straightforward, but heavy
Follow B&W's RVK3670 installation sheet in the Resources tab; B&W documents the complete hitch rather than the base on its own, and the base section of that sheet is what applies here. Grease the polyurethane bushings on the pivot arms before the coupler head goes on.
Watch the installation walkthrough:
Warranty, Shipping & Returns
Warranty. B&W backs this product with its Lifetime Exclusive Limited Warranty: for the original consumer, and for as long as you own the product, B&W warrants it against defects in material and workmanship. B&W's remedy is replacement, or at B&W's option repair or a refund of the purchase price. Installation, removal and shipping costs are not covered, and B&W requires a return authorization (800-248-6564) before any warranty return. B&W does not authorize its dealers or distributors to create any other warranty in connection with the product, so the terms above are B&W's own, described here rather than added to.
Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.
Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.
About B&W Trailer Hitches
B&W Trailer Hitches started in a Humboldt, Kansas garage in 1987, when Roger Baker and Joe Works were building custom truck beds and wanted a gooseneck hitch that did not leave a ball standing up in the bed the other six days of the week. Their answer was the Turnoverball, a ball that flips over and stows flush with the bed floor, and it is still the product the company is best known for. B&W has built hitches in Humboldt ever since and is one of the last hitch makers still manufacturing in the United States.
The company has been 100% employee-owned since 2007, with roughly 500 employee-owners who have a stake in what they build. That shows up in how B&W tests. SAE J-2638 is only a recommended practice for gooseneck and fifth wheel hitches, and where the standard would allow a separate sample for each test, B&W puts a single hitch through all three 300,000-cycle dynamic tests and the six static tests, one after another. The Tow & Stow receiver line is tested to SAE J-684.
Prestige Truck is an authorized B&W Trailer Hitches dealer. Every hitch we ship is new, factory-packed, covered by the full B&W factory warranty, and supported by B&W's own service team in Humboldt, Kansas.
Puck Adjustments For RAM Trucks
RAM's factory puck system has adjustment that owners routinely miss, and getting it wrong makes the base feel loose.
B&W's film covers what to check on a RAM bed before you blame the hitch.
Turning Clearance And When You Need A Slider
B&W walks through how much room a trailer actually needs between its nose and the back of the cab in a tight turn, and how to work out whether your truck and trailer combination needs the sliding version of the hitch.
Worth confirming with a tape measure before you order, because cab-to-nose clearance is what decides whether a slider is the right call.
Installing A Head Leveling Kit
If your trailer sits nose-high or nose-low on the hitch, a head leveling kit is the fix.
B&W shows what the kit does and how it goes on, which is worth understanding before you start shimming anything.
Frequently Asked Questions
Straight answers on specs, fit and support
Will this tow a trailer on its own?
No. This is the sliding base ONLY. It is not a complete fifth wheel hitch: it has no coupler head, so it cannot hold a king pin and cannot tow anything on its own. The complete hitch is B&W RVK3670, which is this base plus the RVC3006 coupler head. A base with no coupler has nothing to grip the king pin with.
What is in the photo, and what is in the box?
The photo is B&W's own picture of the complete RVK3670 hitch, because B&W publishes no separate photograph of this component. In that photo, the lower structure is this base and the head sitting on top of it is the RVC3006 coupler. Only the base is in this box.
Why would I buy a base on its own?
Usually one of three reasons: a base has been damaged, you are moving a coupler head onto a different truck that needs a different base, or you already own a RVC3006 head from another B&W hitch. If you are starting from nothing, buy RVK3670 and get both halves.
Which coupler head goes with it?
RVC3006. It is listed separately in this range. Buying this base and that head together gives you the same hitch as RVK3670, and B&W's installation sheet for RVK3670 covers the assembly.
What does it weigh?
About 192 lb on its own, which is the tell that this is a sliding base: the fixed bases in this family run 78 lb to 96 lb and the sliding ones run 171 lb to 230 lb. That is one of the two boxes of a complete RVK3670, and it is worth knowing before it arrives on a pallet.
How much will it carry?
In the complete RVK3670 hitch, 20,000 lb gross trailer weight with 5,000 lb vertical pin weight. Those are the hitch's numbers. What you can actually tow is the lowest of the hitch rating, your truck's own fifth wheel rating on the door jamb, and, on a rail-mounted hitch, the rails underneath it. A base on its own carries no rating, because a rating only means something for an assembled hitch.
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