There are many different air systems, so without actually seeing what you have, I couldn't say if your system relies on simply the check valve in the drier, or there's one at the intake on your wet tank.
Follow the large discharge line FROM the drier TO the wet tank. If there's a check valve on the tank, you will be able to see it.
I know we used to bypass air driers to get trucks back to work, and those always had a check valve at the tank.
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!