Tim, you sure can. This is what long term campers do. You can get the parts needed at propane suppliers when you explain to them what you're planing to do.
Edit: Be careful, since you're coming in after the regulator you must also install one between your tanks and the quick disconnect.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger