[FrankJ]

To make the chassis complaint with 2011 rules you would need to build a perimeter frame around the chassis. Design your attachment points into the perimeter.

Last year we fabricated a C-Channel that slipped over the KOP simple chassis C-channel. The C-channel was bolted to the bumpers, holes drilled in the bumper C-channel to match the vertical holes in the chassis C-channel vertical holes. The bumpers where attached using Knob detent pins. (similar to grainger # 3JDC3). Bumper change in less than a minute. AndyMark sells a similar system.