There are a lot of short time and seasonal jobs (construction, agriculture, tourist industry, retail) that pay well, but often you will be going where the job takes you, rather than going where you want to go and finding work there. Most of the people working these jobs stay in local temporary housing (thus the reason for so many Econolodges and Super 8s), sometimes with employer support, but others choose to bring along their own housing, which might be RVs if you are using them recreationally.
Then there are the totally nomadic jobs like theater roadie and work in horse racing, rodeo, auto racing, carnival, craft shows, etc. Sometimes an employer provides the mobile housing, other jobs it is BYO. Again, you go with the show. Upper tier in entertainment, earnings in high six figures to tens of millions, can RV but more often have someone move their homes for them and travel more luxuriously. The roadies are in the bunkhouse bus, the stars in the leased jet.
Third category would be high demand, high skill jobs you can do anywhere, like nursing, tax preparation, medical tech. You choose where you want to work, contract for a period, show up. Employer doesn't care whether you live in RV, apartment, long stay hotel, some things work better in some places, others in other places. If you want to live in a RV you don't take a job on Manhattan.
A fourth would be pure marketing, selling ideas, motivational speaking, lifestyle consulting, middle level sales in MLM, especially where no physical products are involved. You could do this travel in a RV, but that somewhat limits your working time and availability. Most in these business make enough that they usually jet first class, have multiple homes in multiple work locations, or stay in top tier resorts where they conduct their business.
So depending on your skill sets, personal drive, and goals, the nomadic lifestyle can be lived at any level from near poverty to fabulously wealthy.
