2026 Forest River Columbus / Puma Mesa388FKH

The Columbus 388FKH has 2,271 lbs of cargo capacity between 14,414 lbs dry and its 16,685 lbs GVWR, 14% of that rating; filling its 75-gallon fresh tank at 8.3 lb a gallon uses 622 lbs of it (how to read trailer weights).

Pin weight is 2,685 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: 188 gallons of grey and black capacity against 75 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the Columbus roster this is the 6th of 8 floorplans by dry weight, in a line that runs from 10,464 lbs to 14,664 lbs. It sits in the heavier third of the line.

Plan the tow on loaded weight, not the 14,414 lbs dry figure: half the published cargo capacity brings this plan to about 15,550 lbs, and the published GVWR of 16,685 lbs is the limit (how to read trailer weights).

Forest River’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 Forest River does not publish that figure (how figures are verified).

Forest River 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. 388FKH is a Columbus designation and this site does not decode it into a layout claim.

How the 388FKH differs from the other seven Columbus floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2026). How these ranks are worked out.

• Length, 42 ft 10 in: second-longest of eight, between the 377DS, 379MBL and 389FLH (42 ft 7 in) and the 384RKH (43 ft).
• Dry weight, 14,414 lb: third-heaviest of eight, between the 377DS (14,339 lb) and the 389FLH (14,529 lb).
• GVWR, 16,685 lb: third-highest of eight, between the 383RLH (16,635 lb) and the 384RKH (16,690 lb).
• Pin weight, 2,685 lb: third-heaviest of eight, between the 383RLH (2,635 lb) and the 384RKH (2,690 lb).
• Cargo capacity, 2,271 lb: fourth-smallest of eight, between the 377DS (2,141 lb) and the 340RG (2,406 lb).
• Cargo capacity as a share of GVWR, 13.6%: fourth-smallest of eight, between the 377DS (13%) and the 384RKH (17.2%).
• Pin weight as a share of dry weight, 18.6%: fourth-smallest of eight, between the 340RG (17.9%) and the 360FK (18.9%).
• Black tank, 78 gal: largest of eight, level with the 377DS; next are the 383RLH and 384RKH (71 gal).
• Grey tank, 110 gal: shared with the 389FLH; of eight, four smaller and two larger, nearest the 340RG, 360FK and two others (78 gal) and the 377DS and 384RKH (117 gal).

Next to the 377DS, the nearest lighter floorplan by dry weight, the 388FKH is 75 lb heavier by dry weight, has a GVWR 205 lb higher, has 130 lb more cargo capacity, has a pin weight 205 lb heavier, is 3 in longer and has a grey tank 7 gal smaller; the two publish the same exterior height, fresh tank and black tank.

Next to the 389FLH, the nearest heavier floorplan by dry weight, the 388FKH is 115 lb lighter by dry weight, has a GVWR 130 lb higher, has 245 lb more cargo capacity, has a pin weight 130 lb heavier, is 3 in longer and has a black tank 39 gal larger; the two publish the same exterior height, fresh tank and grey tank.

Columbus is a tight roster of six large fifth wheels and the numbers barely move across it: 13,609 to 14,664 lb dry over lengths of 41 feet 5 inches to 43 feet. What does move is cargo capacity, 2,026 to 3,026 lb - a thousand-pound spread on trailers within a thousand pounds of each other dry, so the useful comparison inside this line is payload rather than size. Pin weight runs 2,480 to 2,785 lb, and every plan ties out exactly against its published GVWR.

A full 75-gallon fresh tank is about 622 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 27% of the 388FKH’s 2,271 lb cargo capacity, leaving 1,648 lb. Across 8 Columbus floorplans the water share runs 21% to 31%, and 3 give up more than this one. Nearest on that share: Columbus 340RG at 26% and Columbus 377DS at 29%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).