bent rim and axle near Yellowstone (RockSprings gas station), flats every 750 miles home! No lug wrench, waited ~1hr for AutoZone to open, changed tire, bought new rim/tire @tire store next to AutoZone.
Burned out coil on back roads east of Ft Collins, CO headed to Lake Chambers Lake area...
Fixed tanks are not cylinders and the regulator can connect directly.
FWIW, my ole P U had the POL and regulator connected directly to the cylinder.
I replaced the POL with an ACME big threaded nut for ease (the POL is left hand threaded).
My mod worked fine.
congratulation on having your trailer weighed.
I would not worry about lean, you of course could adjust the roof if off.
I always tightened up the shepard poles to help keep the roof from swaying around.
NFPA 1192 Standard on Recreational Vehicles 2005 Edition
search or scroll down to "18.104.22.168 Low-pressure propane connections shall be in accordance with 22.214.171.124(A) through 126.96.36.199(C)."
(A) The connection between a regulator fixed in place and the propane supply system shall be made with a...
my ole coachmen was wired like this, fused @ the battery + (blue), spliced (yellow) into the existing 'charge line' from the trailer tongue. The battery neg was connected to a clamp under the trailer with other 12v neg white wires