Pretty much the same as all the above good advice.
Hose the dust down first. If the canvas was wet or even damp we will set it up in the shed for a night or two , canvas fully erected, then place an oil heater inside the camper till dry.
Also we have taken to putting one of those Hippo damp rid containers in the camper if packing up for a while, you'd be surprised at how much moisture it absorbs. Air the mattress. Now in summer we only sleep on a bottom sheet and mattress protector and sleeping bag. Winter: all bedding comes off, mattress aired. Quick wipe of the kitchen surfaces. Refill water tanks and water jerry cans, check battery levels, trickle charge, check tyres pressures etc and pack her up ready to go. Repack the nose cone box and general tidy up. Occasionally weight the gas bottles. All set for next time. Then we only need to hook her up, food and clothing goes in the back of the Patrol on the morning off departure.