Milk carton, tank foot etc work well for keepng them upright and they MUST be transported upright. I would HIGHLY recomend in the bed of your tow if you are using a pick up. If you must transport in you trailer of 5er make sure to turn off as much as you can and open a couple of windows for venting even tough LP is heaver than air the air flow will hopefully stir up and possible leakage and create a venturi affect to pull ot out. Also this will not apply to most people, but if you haul more than 1000# aggregate wt (tanks and gas) you must be placarded and have a CDL/hazmat endorsment.
Jim & Debbie England
Do you have Gas? 2015 F350 6.2L CCLB DRW 4.30 axle. 2012 Yellowstone Ridgeline 34RLT Fifth Wheel