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.

A full 81-gallon fresh tank is about 676 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 34% of the 3704BH’s 2,002 lb cargo capacity, leaving 1,326 lb (166 lb per rated berth). Across 7 Influence floorplans the water share runs 13% to 34%, and this plan’s is the highest. Nearest on that share: Influence 3904BH at 23%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).

Closest sibling: the Influence 3904BH, nearest on the published figures. It differs on 7 of the 9 fields both publish (this plan first): length 40 ft 4 in vs 42 ft 8 in; sleeps 8 vs 9; dry weight 14,798 lb vs 16,000 lb; GVWR 16,800 lb vs 19,000 lb; cargo capacity 2,002 lb vs 3,000 lb; dry hitch weight 2,728 lb vs 2,700 lb; fresh tank 81 gal vs 83 gal. They match on grey tank and black tank.

Either side of it by GVWR: Influence 3503GK matches it at 16,800 lb GVWR; Influence 3003RL is 1,200 lb heavier (18,000 lb GVWR).

All 7 Influence floorplans: Influence line hub.

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.

16 of the 18 fields this catalogue tracks are published for the 3704BH. Not published: interior height, tire specification.

Sourcing rules: methodology.