2026 East to West Blackthorn / Tandara3865FLR

The Blackthorn 3865FLR leaves East to West's factory at 12,444 lbs dry, with a published GVWR of 16,320 lbs and 3,876 lbs of cargo capacity between the two. Cargo capacity is 24% 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 64-gallon fresh tank spends 531 lbs of that 3,876 lbs before anything else is loaded.

Pin weight is 2,320 lbs, 19% of the dry weight as published; it rises as the trailer is loaded and comes off the truck’s payload, not its towing rating, so check it against the payload on your own door sticker (pin weight and payload).

Off hookups: 132 gallons of grey and black capacity against 64 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the Blackthorn roster this is the 4th of 7 floorplans by dry weight, in a line that runs from 7,324 lbs to 13,439 lbs. It sits in the middle of the line by weight.

Plan the tow on loaded weight, not the 12,444 lbs dry figure: half the published cargo capacity brings this plan to about 14,382 lbs, and the published GVWR of 16,320 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. 3865FLR is a Blackthorn designation and this site does not decode it into a layout claim.

How the 3865FLR differs from the other six Blackthorn floorplans. Most distinctive first. How these ranks are worked out.

• Cargo capacity, 3,876 lb: largest of seven; next is the 3750LK (3,501 lb).
• GVWR, 16,320 lb: second-highest of seven, between the 3880RBDB (16,220 lb) and the 3820DSL (16,350 lb).
• Pin weight, 2,320 lb: second-heaviest of seven, between the 3880RBDB (2,220 lb) and the 3820DSL (2,350 lb).
• Pin weight as a share of dry weight, 18.6%: second-largest of seven, between the 3820DSL (17.5%) and the 2990MK (20.1%).
• Cargo capacity as a share of GVWR, 23.8%: third-largest of seven, between the 2990MK (23.4%) and the 279BH (25.5%).
• Dry weight, 12,444 lb: fourth-lightest of seven, between the 2990MK (10,864 lb) and the 3750LK (12,619 lb).
• Length, 41 ft 11 in: shared with the 3820DSL; of seven, four shorter and one longer, nearest the 3750LK (40 ft 10 in) and the 3880RBDB (42 ft 1 in).

Next to the 2990MK, the nearest lighter floorplan by dry weight, the 3865FLR is 1,580 lb heavier by dry weight, has a GVWR 2,140 lb higher, has 560 lb more cargo capacity, has a pin weight 140 lb heavier and is 6 ft 11 in longer; the two publish the same exterior height, fresh tank, grey tank and black tank.

Next to the 3750LK, the nearest heavier floorplan by dry weight, the 3865FLR is 175 lb lighter by dry weight, has a GVWR 200 lb higher, has 375 lb more cargo capacity, has a pin weight 200 lb heavier, is 1 ft 1 in longer and has a grey tank 20 gal smaller; the two publish the same exterior height, fresh tank and black tank.

Blackthorn is the fifth-wheel end of the East to West range, and it is the one East to West roster where the loaded rating is a published factory number rather than a gap. All seven floorplans carry a GVWR and all seven tie out exactly against dry weight plus cargo capacity -- 9,945 lb at the light end to 16,350 lb at the top. The roster splits in two. Two plans sit in the factory's half-ton grouping at 7,324 and 8,579 lb dry with 1,145 and 1,320 lb on the pin; the other five run 10,864 to 13,439 lb dry with 2,120 to 2,350 lb on the pin. Every one of the seven is a fifth wheel, so that pin load comes off the truck's payload rating rather than its towing rating, and the half-ton grouping is a statement about weight rather than about hitch type. Cargo capacity runs 2,621 to 3,876 lb, and lengths run 28 ft 1 in to 42 ft 1 in.

A full 64-gallon fresh tank is about 531 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 14% of the 3865FLR’s 3,876 lb cargo capacity, leaving 3,345 lb. Across 7 Blackthorn floorplans the water share runs 14% to 20%, and this plan’s is the lowest. Nearest on that share: Blackthorn 3750LK at 15%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).