Bumper cargo rack on 5er?

PNW_Steve wrote:
Hey Everyone,

I am considering building a cargo rack similar to this:

http://www.northerntool.com/shop/tools/product_200623836_200623836

Similar in form but built heavier and larger. I am looking at 24"x90" to accommodate moving my generator and storage box from the pickup bed to the back of the trailer.

My thought is to have two 2" square tube bolted to the frame rails where they meet the back bumper. The 2" square tube would support a 24"x90" platform made from 1 1/2" angle. Picture the rack in the link except with two support tubes 5' apart instead of one in the middle.

I am a bit concerned about weight. My intended load is going to be 350-400lbs.

I am sure I am not the first one here to undertake a project like this.. Show me yours :)

Any suggestions would be appreciated.

Steve