An old secret for nicely supporting the common 20 lb. (5 gallon) propane tanks during transportaion is to put each one in one of these rugged baskets that last for years so that the tanks cannot tip over or scrape anything - a 5 gallon propane tank perfectly fits inside these:
https://www.homedepot.com/p/GSC-Technologies-11-in-x-13-in-x-13-in-Black-Milk-Crate-MC131311-002/204793156We store our extra 10 lb. and 20 lb. RV propane tanks in unvented exterior storage cabinets. Just in case the valve on these tanks should ever tend to leak a little with age, there are available brass sealing knobs that screw right onto where you normally attach tank hoses to the 10 lb. and 20 lb. tanks. These brass sealing knobs are a second line of defense against tank leakage during storage and transportaion.
