2026 East to West Longitude315FB

The Longitude 315FB leaves East to West's factory at 8,033 lbs dry, with a published GVWR of 9,400 lbs and 1,367 lbs of cargo capacity between the two. Cargo capacity is 15% of the loaded rating, and East to West's own definition is worth reading before you plan against it: cargo capacity is what remains for fresh water, gear, food, batteries and every dealer-installed accessory. Fresh water alone is 8.3 lb per gallon, so filling this trailer's 39-gallon fresh tank spends 324 lbs of that 1,367 lbs before anything else is loaded.

Tongue weight is 840 lbs, 10% of the dry weight as published; it rises as the trailer is loaded and counts against the tow vehicle’s tongue-weight and payload limits (tongue weight by size).

Off hookups: 120 gallons of grey and black capacity against 39 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the Longitude roster this is the 8th of 8 floorplans by dry weight, in a line that runs from 5,293 lbs to 8,033 lbs. It is the heaviest plan in the line, so the tow vehicle should be settled before the floorplan is.

Plan the tow on loaded weight, not the 8,033 lbs dry figure: half the published cargo capacity brings this plan to about 8,717 lbs, and the published GVWR of 9,400 lbs is the limit (how to read trailer weights).

East to West’s line listing and this floorplan’s own factory page agree on all 4 shared figures. Dry weight plus cargo capacity equals the published GVWR exactly. A missing row means East to West does not publish that figure (how figures are verified).

East to West publishes no floorplan description for this plan in the channel this page is built from - only the numeric specification block. Rather than describe a layout from the floorplan code, which would be a guess dressed as a fact, this page carries what the factory publishes and says where it stops. 315FB is a Longitude designation and this site does not decode it into a layout claim.

How the 315FB differs from the other seven Longitude floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2026). How these ranks are worked out.

• Dry weight, 8,033 lb: heaviest of eight; next is the 319BH (7,788 lb).
• Cargo capacity, 1,367 lb: smallest of eight; next is the 255BH (1,582 lb).
• Cargo capacity as a share of GVWR, 14.5%: smallest of eight; next is the 255BH (20.7%).
• Tongue weight as a share of dry weight, 10.5%: smallest of eight; next is the 255BH (10.7%).
• Exterior height, 11 ft 5 in: tallest of eight; next are the 185RB, 230FK and five others (11 ft 2 in).
• Fresh tank, 39 gal: smallest of eight; next is the 250RD (46 gal).
• Grey tank, 90 gal: largest of eight; next are the 185RB, 230FK and five others (60 gal).
• Length, 35 ft 11 in: second-longest of eight, between the 310RL (35 ft 10 in) and the 319BH (38 ft 1 in).
• GVWR, 9,400 lb: fourth-lowest of eight, between the 185RB (7,740 lb) and the 230FK (9,630 lb).
• Tongue weight, 840 lb: fourth-heaviest of eight, between the 230FK (830 lb) and the 285BH and 310RL (880 lb).

Next to the 319BH, the nearest lighter floorplan by dry weight, the 315FB is 245 lb heavier by dry weight, has a GVWR 1,935 lb lower, has 2,180 lb less cargo capacity, has a tongue weight 95 lb lighter, is 2 ft 2 in shorter, stands 3 in taller, has a fresh tank 14 gal smaller and has a grey tank 30 gal larger; the two publish the same black tank.

Longitude is the only East to West line on this site that publishes a GVWR, and it is worth saying plainly what that buys you: on all seven plans where East to West publishes one, dry weight plus cargo capacity equals the published GVWR exactly. That arithmetic tying out is the difference between a loaded rating you can plan a tow around and a number somebody added up. GVWR runs 7,650 to 11,335 lb across the seven, against dry weights of 5,293 to 8,033 lb and cargo capacity of 1,367 to 3,572 lb. Tongue weight runs 650 to 935 lb, all bumper pull. Three more floorplans are published on the roster with no weights at all yet, and they are listed as announced rather than given specifications they do not have.

A full 39-gallon fresh tank is about 324 lb of water (water counts as cargo: 49 CFR 571.110 S9.3.2), 24% of the 315FB’s 1,367 lb cargo capacity, leaving 1,043 lb. Across 8 Longitude floorplans the water share runs 12% to 28%, and 2 give up more than this one. Nearest on that share: Longitude 285BH at 21% and Longitude 250RD at 24%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.110 S9.3.3).