I had no skills or experience that would easily translate into a mobile friendly job and what I'd gone to school for (vet tech) wasn't something I could do from the road either.
So my first year on the road I paid my way exclusively through work-camping jobs. Yes, the majority of them are at or near minimum wage but it's certainly doable if you're frugal, and if you're wife is bringing in income it could work - just make sure you're staying places that have good internet access for her work. I did National Parks in the summer (Badlands first year, Zion second year, Yellowstone last year) and Amazon.com's CamperForce program in the fall, which is hard physical labor and long hours but I grossed $6,100 in just shy of 10 weeks last year.
Building mobile income streams is something you can work on as you go. Between work-camping jobs I got serious with my writing, released an e-book last spring (second one is almost done now) and have a blog and now in my fourth year on the road I shouldn't have to work a seasonal job this summer because the income from my writing is finally getting to the point where I can live on it.
It takes time to build a business from scratch. But if you pick something and stick with it it's certainly doable. Good luck!