Barbara et al,
The only things you can do is:
Turn off your heater
Turn off and blank off one vacuum (if twin vac)
Use MS to do your cleaning and only use your machine as a clean water extraction.
BUY A TM!!
We do a few sites, some run on 5A supplies, so we avoid them like the plague, others are on 10A which can still cause problems, very few have 13A supplies.
Caravans (or Holiday homes if you're posh!!) are normally very easy to clean, we charge a standard £75 for upholstery and carpets (generally no more than 15-20m2, only takes 1 - 2 hours max.