New purchase - Protective Asset Protection

Wait. Your new motorhome comes with a 1-2 year warranty, most likely a bumper to bumper. In addition all the appliances and climate systems have their own warranty which range from 1-3 years. So wait and see what gives you trouble and then and only then look at an extended warranty. Read the fine print as some of the components require annual service to maintain the warranty.
Additionally start looking for who is going to do chassis work. It's harder that you might think.