What does the manufacturer say? Most say “no.” Look in your owner booklet. It’s not just the total weight…it’s the bouncing weight.
GD Booklet, page 159…
Rear Bumper
The rear bumper of your RV is not designed to carry cargo.
• Items that extend beyond the bumper will place undo strain on the bumper.
• Over time, weight added to the bumper will cause damage from the motion created while traveling.
NOTICE
DO NOT add items to the RV rear bumper. Add-on items will eventually damage your bumper. Damage caused by such aftermarket equipment installation or improper loading voids the Limited Base Warranty & Limited Structural Warranty.
Exterior Care
• Extra weight behind the axle may reduce the hitch weight (leading to adverse handling conditions from wind gusts and/or passing traffic).