Yep, just use the cheapest dex vi or equivalent you can find. The hydraulic systems in RVs have very little demand on them, so no use wasting $$$ on expensive ATF fluids.
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder