Hi , and Welcome to iRV2.
The air suspension would be supplied by the Chassis maker, and leveling sensors and auto dump valves, would be solid mounted to the frame.
A couple of questions.
Is this storage area below the coach floor level ?
Would it be possible for you to post a picture of the valves in question ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.