Carriage of extra Gas cylinders.

Hi all, I have noticed that in your reference 11335 (Archived - Re problems of carriage of extra LPG Bottles). I have a 20'- 6" semi off road design caravan & I required extra LPG bottles for the long free camp runs. I have over come this problem with some bolt on brackets which attach to the drawbar RHS section of my caravan. They fit directly behind the existing bottles which came with the caravan when purchased. They sit 350 mm inside each side of the width of the caravan (EG total width of caravan is 2350mm, outside to outside of gas bottles is 1450mm). The great thing with these brackets is that when you do not require extra gas bottles they can be removed & stored away until next time. I have jumped on, pushed & shoved these brackets & they do not move. They have a lockable cover which goes over the connecting bolts eliminating theft. I am not sure of the legalities from state to state however, I believe that they will satisfy the insurers as the bottles are basically in the same position as the original bottles, a bit wider and inside the width of the caravan. I would appreciate any constructive feed back.