Has anyone built a service skid to forklift in/out of their truck?

Thinking about building a skid out of treated 4x4s and 2x6s that I can slide in the bed of the truck, then bolt a 55 gallon diesel transfer tank (wire up a pump to the 7-pin trailer connector), JD triangle toolbox, and JD 8 gallon gas powered air compressor.

Would like to construct it so that I can still access the gooseneck ball.