I have a propane generator, which uses alot of propane to run ( bad info from my salesperson). I need to add additional propane. Any suggestions on how. I have a Ford F250 Super Duty 4X4 with short bed and tool box. I would like to know if you can transport propane tank lying down in bed of truck and then stand them upright when you get ready to use. If you can I could get two 100# cylinders which would give me 48 additional hrs of use. Thanks.