2026 Forest RiverShasta Phoenix 391MBH

Forest River lists the 2026 Shasta Phoenix 391MBH at 12,445 lb dry, a GVWR of 14,500 lb, a net carrying capacity of 2,055 lb and a pin weight of 2,240 lb. Its dry weight plus its carrying capacity comes to exactly its GVWR.

It is 42' 2" long and 13' high. Forest River prints its tanks as 48 gal fresh, 85 gal grey, 45 gal black.

Among the 17 Shasta Phoenix floorplans Forest River lists for 2026 with a published dry weight, it is number 15 from the lightest, in a range from 7,365 lb (Shasta Phoenix 218SE) to 13,030 lb (Shasta Phoenix 373MBRB). Every figure in that comparison is Forest River’s, for the same model year.

Every number on this page was read on 5 Nov 2026 from Forest River’s 2026 Shasta Phoenix sheet, the maker’s own dated document for model year 2026.

How the 391MBH differs from the other sixteen Shasta Phoenix floorplans. Most distinctive first. How these ranks are worked out.

• Dry weight, 12,445 lb: third-heaviest of seventeen, between the 370BAF (12,421 lb) and the 389DEK (12,721 lb).
• Pin weight, 2,240 lb: third-heaviest of seventeen, between the 373MBRB (2,219 lb) and the 389DEK (2,320 lb).
• Cargo capacity as a share of GVWR, 14.2%: fourth-smallest of seventeen, between the 218SE (13.4%) and the 370BAF (14.3%).
• Cargo capacity, 2,055 lb: sixth-smallest of seventeen, between the 30RLS (2,020 lb) and the 370BAF (2,079 lb).
• Length, 42 ft 2 in: seventh-longest of seventeen, between the 368TBH (42 ft) and the 389DEK (42 ft 4 in).
• Pin weight as a share of dry weight, 18%: eighth-largest of seventeen, between the 27BAR and 336RL (17.9%) and the 389DEK (18.2%).
• GVWR, 14,500 lb: shared with the 370BAF, 381DBL and 389DEK; of seventeen, ten lower and three higher, nearest the 360BH (14,000 lb) and the 334FL and 373MBRB (15,000 lb).
• Exterior height, 13 ft: tallest of sixteen, level with the 334FL, 367BH and four others; next are the 298RLS, 336RL and 360BH (12 ft 10 in).
• Grey tank, 85 gal: shared with the 334FL; of seventeen, six smaller and nine larger, nearest the 30BHS, 30RLS and 31BH (66 gal) and the 298RLS, 336RL and 360BH (90 gal).
• Black tank, 45 gal: shared with the 298RLS, 334FL and three others; of seventeen, six smaller and five larger, nearest the 218SE, 254RLS and four others (33 gal) and the 368TBH (66 gal).

Next to the 370BAF, the nearest lighter floorplan by dry weight, the 391MBH is 24 lb heavier by dry weight, has 24 lb less cargo capacity, has a pin weight 88 lb heavier, is 4 in shorter, has a grey tank 27 gal smaller and has a black tank 27 gal smaller; the two publish the same GVWR, exterior height and fresh tank.

Next to the 389DEK, the nearest heavier floorplan by dry weight, the 391MBH is 276 lb lighter by dry weight, has 276 lb more cargo capacity, has a pin weight 80 lb lighter, is 2 in shorter and has a grey tank 50 gal smaller; the two publish the same GVWR, exterior height, fresh tank and black tank.

Forest River lists 17 Shasta Phoenix floorplans for 2026; this site profiles every one with a printed weight, from Forest River’s own 2026 Shasta Phoenix sheet.

A full 48-gallon fresh tank is about 398 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 19% of the Shasta Phoenix 391MBH’s 2,055 lb cargo capacity, leaving 1,657 lb. Across 17 Shasta Phoenix floorplans the water share runs 13% to 29%, and 3 give up more than this one. Nearest on that share: Shasta Phoenix 370BAF at 19% and Shasta Phoenix 373MBRB at 20%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).