I picked up one of
a 5# tank at a "patio sale" in an RV park in Mission TX for under $10, had it re-certified with a new OPD valve installed and filled for about $25. Works great for grilling when in our B+ with our
Fold N Go Grill. I carry a Weber Baby Q with a #11 tank in our Sport Trac toad behind the Phaeton. Have thought about a tapping into the on board propane on the Phaeton, but our tank is on the driver's side, using the available kits, takes a lot of hose under the RV to the picnic table on the passenger side.