On most regulators, the other end is a hand-tightened connection. Remove that first, after shutting off the supply valve, and then you should have ample room to remove the hose. (It might take two wrenches.) BTW, for years I've carried an extra regulator, which can be purchased for $30-50 depending on type. (Lowes carries them, but make certain whatever you buy has the vent facing down when installed.) RV regulators are dual chambered and are vulnerable to a number of failures: overpressure, moisture in tank (freezes as it enters regular), overfilling, and more. Two things I always check for before allowing anyone to fill my tank: turn off the supply valve yourself since inexperienced employees can easily forget this; re-open the supply valve yourself very slowly at first to prevent a surge on the internal expansion chamber bladders. PS- tanks are full at aprox. 85% of volume, which will indicate full on most tank gages.
2018 Berkshire 38A