Jamboree Rack Design

[SR1355]

After seeing Cris B. inspirational rack design I decided to get off the couch and get to work.

Over the weekend I designed and built a full size mock up for a Jamboree Rack. Rack will be 18X48X4.75 mounted off spare tire mount. Spare tire mount will be relocated outward 1 1/2" and rack was designed to allow 35" tire on spare carrier.

Does anyone know a safe load limit for spare tire carrier. I use it as a step to roof rack right now and it seems pretty stout. My 200# seems to not bother it, I know that with the rack and tire, leverage is going to come into play but still think is should be able to carry a fair amount of weight. I hope to carry two 5 gallon J-Cans and a 58 QT cooler.

I've attached some images from modelling software as well as photochop of rack installed on H3. Plans and cut list are at fabricators for estimate right now.

Any input would be appreciated, I took tailgate apart and looks like connection of spare tire carrier is reinforced.