What you don't want to do is feed the WEBER regulator with your propane connections on your your trailer that is also already regulated...
You can go directly to the propane tanks and be ok.
If you remove the regulator on the Weber then you will be ok but that doesn't allow you to use your weber with the other portable propane tanks you want to use...
With all of this in mind alot of folks just get a 20 lbs propane tank just for the Weber and use it that way. 20 lb tank will last a long time...
I personally like to use the 1lb canisters as that makes me always have a supply of those on-hand for PLAN B things...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"