Another consider is fuel tax. Every state is different but when lp is delivered into motor vehicle it becomes subject to motor fuel tax. I think right now the Federal government first collects .20 and then allows a .50 tax credit but it is a lot of paper work. I have been a fuel distributor and interstate trucker for over 40 years and if it were not part of my business, I wouldn't mess with the paper work. And the propane tanks have to be so large that you can't hide them.
