TC, Take it from a Hold-Out. Get custom valves and get them installed. Had ours installed and balanced at the local Navy Base and they had no problems with the balancer. New tires at Discount Tire, no problem there. Navy wouldn't work on the MH, so I put the coach up on stands and brought them all seven wheels. Discount would work on it, but it was easier for me to have it on stands and again bring them just the wheels.
CAUTION!!! I didn't just happen to have it up on stands, or put it on stands for tires at Discount. I was replacing rear brake calipers and saw two tires failing with cracks down in the tread ribs. It was THEN that I fumbled an Inner and it fell on that long stem. I din't have a cap on it, so it buggered the actual Core area. That was when I called Bill at Dually Valve and he sent me a free replacement that arrived next day.
I installed ordinary metal truck valves on front and spare. The Ford wheel shape kept me from getting the air chuck on the short valves I'd gotten so I was using an extension to check air. Removed extension and replaced cap when done. Then I got the "Gator" aka "V2B" Airless Caps and found they provide the little bit of extension needed with short metal valves.
It's a Cap in itself so you don't need to add one. Dually and T-M both sell six wheel kits with angled valves for the fronts. You really don't need those with slightly longer ordinary valves or even short valves plus Gator Cap.
Wife was sitting out when I unlocked the cab door, got the gauge, checked six tires and two air bags then mut the gauge away, all in about ONE MINUTE. Only 'cause I already had my glasses on.
Extensions put weight on your valves. They also offer a point of potential leakage.
What Wheel Covers to you have, that 7" inner dual valves won't reach?
