The motorhome is a great idea for a SHTF times where you can move anywhere. There is some dangers to a motorhome that you need to think about. The biggest danger is an EMP attack which would make the motorhome not work or move. But an EMP does the same to a house and all vehicles. The other dangers are that you would need to find somewhere away from all cities to park it in a SHTF times.
One of the problems with a motorhome is where to store a year of food and need to find a river or water supply. Remember to store water filters, good ones.