2026 East to West Blackthorn / Tandara3880RBDB

The Blackthorn 3880RBDB leaves East to West's factory at 13,019 lbs dry, with a published GVWR of 16,220 lbs and 3,201 lbs of cargo capacity between the two. Cargo capacity is 20% 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 3,201 lbs before anything else is loaded.

Dry pin weight is 2,220 lbs, which is 17% of the dry weight. That figure lands on the truck's rear axle and comes straight off its payload rating - not its towing rating, which is the number most often quoted and the wrong one for this decision. Pin weight rises as the trailer is loaded, and a fifth wheel loaded toward its cargo capacity will put substantially more than 2,220 lbs over the bed. Read the payload figure on your own door sticker rather than a brochure maximum for the model.

Tank capacities are 64 gallons fresh, 132 grey and 88 black, 220 gallons of waste capacity against 64 gallons of supply. The ratio is what governs how long the trailer can sit off hookups: waste capacity exceeds fresh, so the fresh tank is the binding constraint and refilling extends the stay. East to West publishes these three figures per floorplan, and they are the factory's numbers rather than a segment average.

Against the rest of the Blackthorn roster this is the 6th of 7 floorplans by dry weight, in a line that runs from 7,324 lbs to 13,439 lbs. It sits in the heavier third of the line. Comparing floorplans inside one line is more reliable than comparing across brands, because every figure here comes from the same factory channel on the same day.

A useful way to read the pair of weights is to stop planning against the dry figure. Nobody tows a trailer at 13,019 lbs: that is the weight before water, batteries, propane, bedding, food, tools and anything the dealer bolted on. Load half the published cargo capacity, which is modest for a family trip, and this plan is already near 14,619 lbs on the road. Compare that number against the tow vehicle, not the dry weight, and leave margin on top of it - the published GVWR of 16,220 lbs is a limit rather than a target.

Every number above was captured twice from East to West and checked against itself before it was published. The line listing and the individual floorplan page are two separate factory renderings of the same trailer, and this plan's 4 shared figures agree exactly on both. Dry weight plus cargo capacity also equals the published GVWR exactly, which is the arithmetic check this site runs on every profiled floorplan. Where a figure is missing from this page it is because East to West does not publish it in this channel, not because it was hard to find - and the row says so rather than being quietly dropped.

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. 3880RBDB is a Blackthorn designation and this site does not decode it into a layout claim.

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 534 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 17% of the 3880RBDB’s 3,201 lb cargo capacity, leaving 2,667 lb. Across 7 Blackthorn floorplans the water share runs 14% to 20%, and 3 give up more than this one. Nearest on that share: Blackthorn 2990MK at 16% and Blackthorn 279BH at 18%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).

Closest sibling: the Blackthorn 3820DSL, nearest on the published figures. It differs on 5 of the 8 fields both publish (this plan first): length 42 ft 1 in vs 41 ft 11 in; dry weight 13,019 lb vs 13,439 lb; GVWR 16,220 lb vs 16,350 lb; cargo capacity 3,201 lb vs 2,911 lb; dry hitch weight 2,220 lb vs 2,350 lb. They match on fresh tank, grey tank and black tank.

Either side of it by GVWR: Blackthorn 3750LK is 100 lb lighter (16,120 lb GVWR); Blackthorn 3865FLR is 100 lb heavier (16,320 lb GVWR).

All 7 Blackthorn floorplans: Blackthorn line hub.

Against the 3880RBDB: the Cedar Creek 345IK is 30 lb lighter and 3 ft shorter; the Wolf Pack 397STAY is 65 lb lighter and 1 ft longer; the Sandpiper 3844QUAD is 75 lb heavier.

11 of the 18 fields this catalogue tracks are published for the 3880RBDB. Not published: interior height, sleeps, slide count, axle count, tire specification, refrigerator, air conditioning.

Sourcing rules: methodology.