When I had mine done, I wanted to include a tire rotation for some odd wear on the fronts. I'd spent some time at a large truck shop, talking tires, valves, wear, rotation, etc. Realized I wanted some of the tires "flipped" on their rims so the worn edges got re-positioned.
Otherwise:
And I offer this waving a red flag and yelling SAFETY!
1. Loosen lug nuts
2. Raise RV and place stands/blocks under chassis
3. Remove wheel
4. Remove valve core
5. Slide wheel under RV - or some other big heavy "thing"
6. Position wheel under chassis
7. Use bottle jack base on tire at rim bead and "jack" the RV
8. Pressure will break bead
9. Change valve, Inflate, etc...
Done VERY carefully, this will work. If you want Quick'N'Dirty, install the valves, air up and call it GOOD. The duals become a unit once installed. If they were in balance before, the new valves will add their weight opposite each other and pretty much cancel.
But make sure you follow the install instructions completely. The nut that holds these custom valves and their gaskets together is on the Inside. Ordinary metal valves have them on the Outside and you can tighten later if needed. Lots of corrective surgery if the custom valves aren't done right the first time.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB