Teardrops n Tiny Travel Trailers

This is a drawing of one of the four corner guides that I think are necessary, as the Top Box is lifted or lowered over the Bottom Box. I'm just using 1 inch Schedule 40 PVC Pipe vertically, on the inside of the Top Box, and mating (half-split), 1 1/4 inch Schedule 40 PVC Pipe to run along the smaller pipe. The 1 inch pipe in the Top Box is mounted on two 1/8 inch copper pipe which allows it to wiggle from side to side about 3/16 inch total.