As alot of you know, I maintain a trailer for our scout troop of 60 boys. We've been considering purchasing 5-gal propane tanks and the requisite distribution trees and lines to use with both our lanterns (which mount to the top of the trees) and our propane stoves for cooking. Beats the heck out of the little propane tanks. My question - Does anyone know of a good way to securely mount 4 of these in a racking system? I've got space at the very rear of the trailer (inside), but am looking for suggestions on mounting/strapping them down. I can build a sturdy shelving system and router out the wood to set the circular base and top in to, but would still like some sort of strapping system to really hold them in place. I don't want to mount them up on the front tounge. I've got enough weight on the front tounge of the trailer as it is (and I really don't want to know how much it really is or add more). Thanks!