We've all used sawhorses to camp chairs to folding cots trying to get our yaks stable for rigging and storage. Herb Reyes has adapted a folding PVC cradle that's cheap, easy to fabricate, and works like a charm!
Homemade PVC kayak rack , can store 4 kayaks,paddles,kayak car rack .made from 1.5" schedule 40 PVC (cost around $250 in 2015 prices) has 4 swiveling casters with two being lock kind ( otherwise rack will roll away when loading) . To make the wheel mounts I used 1 1/4" metal conduit cut to 2.5' long and weld a pre-drilled plate for the wheel . I bolted thru the PVC and conduit pipe to lock them together. The conduit helps reinforces the PVC when pushing the cart around .
Constructed of 2" PVC for weight support. This stand was built to occupy 2- 70 lb kayaks. I added paddle hooks on the inside & outside of the front length for paddle storage, and a UV/Weather Resistant reflective tarp for added protection.