2026 Grand Design Influence3904BH

The 3904BH is the top of the Influence bunkhouse range: a private bunkhouse sleeping five, an outdoor kitchen (griddle, sink and beverage cooler), a U-shaped dinette, dual entry doors (one into a half bath for a bath-and-a-half) and quad slides in a widebody layout, with theater seating and a front private bedroom — the whole coach sleeping nine, the most in the line. Dual opposing living slides open a wide main level. The equipment is the standard Influence package — a 16-cubic-foot 12-volt refrigerator, gel-coat sidewalls and the 330-watt Influence Solar Package — on the 101-inch wide-body platform inside a five-sided welded-aluminum cage, under a walk-on Thermal Roof, with a fully enclosed, heated underbelly.

Grand Design publishes a 19,000-pound GVWR against the 16,000-pound dry weight — the heaviest in the line — leaving a 3,000-pound cargo capacity and a 2,700-pound dry pin. A 30,000-BTU air-conditioning rating and 83/106/106-gallon fresh/grey/black tanks are standard, with six-point auto-leveling available. RVUSA does not carry a starting MSRP for the 3904BH; dealers list it in the mid-to-high $130,000s. It is the Influence for large families who want a private bunkhouse, an outdoor kitchen and a bath-and-a-half in the longest coach in the line, towed with a one-ton truck.

Influence is Grand Design's residential-style full-profile fifth wheel on the 101-inch wide-body platform that underpins the flagship Solitude, offered at a lower entry point — a cross-shop against Keystone's Cougar and Montana, Jayco's Eagle and North Point, with the Grand Design Reflection a step below. The 2026 line runs to seven floorplans, all profiled in full and linked below. The 3904BH on this page is highlighted.

This floorplan carries its water comfortably. A full 83-gallon fresh tank is roughly 23% of the 3,000-pound cargo capacity, leaving the 3904BH with a usable gear budget even when you tow full.

The published dry pin weight of 2,700 pounds is 17% of this floorplan’s 16,000-pound dry weight. Fifth-wheel pin weight rides in the bed of the truck, so it comes off payload rather than off tow rating — and it rises with the trailer as you load it, not in proportion to what you put over the axles.

Nothing above changes the ceiling. Loaded to its 19,000-pound GVWR the 3904BH is towing 3,000 pounds more than its 16,000-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 83 gallons of fresh against 106 grey and 106 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Of the 7 Influence floorplans profiled here, the 3904BH carries the highest GVWR at 19,000 pounds. It is the top of the line by weight, which makes tow-vehicle capability the first thing to settle rather than the last.

Either side of it in the same line: Influence 3804DS matches it exactly at 19,000 lb GVWR.

1 other Influence plan shares this floorplan’s 19,000 lb GVWR, so the ranking above separates plans that tow to the same ceiling. On a shared chassis the figure that actually differs between them is cargo capacity and where the weight sits, not the rating.

Against the 3904BH: the Momentum 344M is 3 ft shorter and sleeps 3 fewer; the Paradigm 385FL is 1 ft shorter and sleeps 3 fewer; the Solitude 310GK is 8 ft shorter and sleeps 5 fewer. Those are differences in the published numbers only — what they cost, how they are built and how they live are separate questions each of those pages answers on its own terms.

Those are the nearest fifth wheels from other lines by weight — one per line, picked by proximity on that figure and nothing else. They are listed so the same tow vehicle can be checked against real alternatives, not because they are equivalent inside; layout, build and price diverge sharply across that group.

For scale, the Influence floorplans profiled here run 11,800 to 16,000 pounds dry and 34 to 43 feet of exterior length across 7 plans. Where a floorplan falls in that spread usually says more about which vehicle can tow it, and which site it fits, than the layout name does.

Every profiled floorplan in this line, with the full weight table, is on the Influence line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 16 of them for the 3904BH. The rest are not shown, because the alternative is reading a figure across from a sibling floorplan or from what the segment usually does — and a number nobody published is worth less than an admitted gap.

Not published for this floorplan: interior height, tire specification. If you find one of these in a manufacturer document for this plan, it belongs on this page.

The completeness figure at the foot of this page (94%) measures the same thing on the full field set: it is a measurement of how much this floorplan’s manufacturer publishes, not of how much research went into the page.

How every figure here was sourced and checked is set out on the methodology page.