Often times if the two main rooms are hydraulic, they will ALL extend or retract with a single switch. There is a Grand Designs Solitude with 5 slides, three are hydraulic and move with a single switch.
If the slides are electric, it shouldn’t matter which one you start with, just don’t do both at the same time.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.