2026 Grand Design Influence3704BH

The 3704BH is the Influence family bunkhouse: a private rear bunk room, a front private bedroom and four slide-outs in a widebody layout, sleeping eight — the most berths short of the 3904BH. The rear bunk room and front bedroom bracket a wide main level, with dual entries into the coach. At about 40 feet on quad slides it is the largest three-bedroom-capable plan in the line short of the dual-master 3804DS. 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 16,800-pound GVWR against the 14,798-pound dry weight, leaving a 2,002-pound cargo capacity — the tightest in the line — and a 2,728-pound dry pin. A single 15,000-BTU air conditioner and 81/106/106-gallon fresh/grey/black tanks — with a larger 106-gallon black tank for family use — are standard, with six-point auto-leveling available. At a starting MSRP around $119,459, with street pricing below placard, the 3704BH is the Influence for families who want a private bunk room and a front bedroom in a widebody coach, towed with a one-ton truck — load it carefully against its tight cargo margin.

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 3704BH on this page is highlighted.

Fresh water is the single biggest line in this floorplan’s load plan. A full 81-gallon tank is about 34% of the 2,002-pound cargo capacity — enough that whether you tow with water aboard is a real decision on the 3704BH rather than a detail.

The published dry pin weight of 2,728 pounds is 18% of this floorplan’s 14,798-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 16,800-pound GVWR the 3704BH is towing 2,002 pounds more than its 14,798-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 81 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.

Ranked by GVWR, the 3704BH sits 4 of 7 in the Influence line: 16,800 pounds against a line that runs from 15,000 to 19,000 pounds. That position is the useful thing to know, because the plans immediately either side of it are the real alternatives.

Either side of it in the same line: Influence 3503GK matches it exactly at 16,800 lb GVWR; and Influence 3003RL is 1,200 pounds heavier at 18,000 lb GVWR.

2 other Influence plans share this floorplan’s 16,800 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 3704BH: the Nightfall 350N is 10 lb lighter; the Cedar Creek 380DB is 15 lb heavier and 3 ft longer and sleeps 2 more; the Columbus 379MBL is 15 lb lighter and 2 ft longer. 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 3704BH. 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 (95%) 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.