Hi All. I purchased a used 5X10 open utility trailer the other day. It's built with all square tube. really nice. I want to put a ramp on it. The ramp will be 5' wide and about 4-5' long and will fold in the middle so it's not so high.. I will use the steel mesh on top. What material(ie tube, angle) and what guage should I use? I will be using it to load 500lb motorcycles and myself of course, so the total will be about 700 lbs. Thanks.