If its just to get to repair I wouldn't futz a/the air drier unless it is convenient to you. Once you've dumped the air a coupla times and aired back up on the coach's dried air system you'll never know the difference. Dried air will absorb moisture introduced into the system quite quickly and dispell it when dumped.
If this is to be a regular habit, the air dryer on your compressor is a good safeguard.
Ditto on Dale's concern as to holding sufficiently till you get to service. You should know based on how fast it leaks before you can take off and how far you have to go. If that looks like a challenge, you may need repair where it is, at least of the gross leak. Or maybe you can stop periodically and refill the bags w/a portable compressor.
This is one of those chores where a RV PowerTank
would come in handy.