Once again you've asked good but seemingly hot button question. I have a spare and just a few months ago I scraped a curb and ripped a sidewall. I was a half block from home and changed the tire myself. I raised the coach a little with the levelers and then used my 6 Ton bottle jack to raise the axle and tire.
The specs for the torque setting was in the owners manual from Ford and I did it with a 24" breaker bar from Harbor freight. In the field, I would re-torque to a best guess. It is a good idea to know the torque specs, a lot of tire jockeys don't even care how much torque to apply. We had a 2006 Suzuki Grand Vitara and it had new tires when we bought it. Just to make sure things were good, I checked the lug nut torque. It was about 140 ftlbs before the torque wrench clicked. If your Winnie is on a F53 chassis the torque would be about 150 ft lbs, I don't know your year or GVWR so it's hard to say 150 unequivocally, I know mine is.
If it makes you feel more secure, definitely research what is available, try "etrailer.com", and Google(Bing whatever) and find out what others have done. Try an owners club or How To videos on YouTube.
