Mostly a reverse of the steps used to winterize.
Check batteries, state of charge; clean connections.
Fresh water into the holding tank, run the pump to flush any RV A/F out of the lines. Open the water heater by-pass and fill the heater, re-flush the lines.
Drain and sanitize the fresh tank & re-flush the lines.
Test fire all propane systems check for ; wasp nests in furnace and fridge vents first.
Inspect roof seams for pealing sealant, cycle the slides & levelers , checking for proper operation.
Check all fluid levels , tire pressures , all the lights, just like you would pre-trip, start the coach, check alternator out put , take rig out for a 1/2 hour road test, drain the holding tanks, and recheck all fluids on your return.
Wash , wax, fill with fuel. Spend a night in the coach in your yard or driveway if possible , or book a night in a local RV park , so at least if something is wrong your close to home to get tools or parts.
Then get out and enjoy your trip.
EDIT: Forgot , test run gen set , make sure all engine servicing is up to date.