This guy Brett was using a hammock instead of a tent.
It is a fascinating question for me, a budget for touring. Of course one likely has fixed expenses back home and then one is not likely to be bringing in an income while touring. That is probably the biggest chunk, quite separate from direct expenses on tour.
There is whatever expenses are involved to getting to the tour starting point... plane fare or maybe get a space on a freighter!
Mostly I should think the direct expenses while touring are mostly food and lodging. One can buy food from grocery stores and prepare it oneself, cooking etc., or got to restaurants. That probably spans roughly $10/day up to maybe $60.
Lodging... out in the wild one can camp wherever. Then there are campgrounds, then cheap motels, then nice ones. That's maybe $0 to $120 roughly.
A person could ride out to Montana in a month for sure. Say the total cost range is $20/day to $200/day, so that's $600 to $6000 for the full ride. Maybe $2000 for a nice mix of meals and lodging.
Call it $2000 for fixed expenses back home, $2000 for transport to/from the tour, $2000 for the tour itself, that's $6000. Median income in these parts is maybe $3000/month. So a big tour is about two months of income.
I hope to try one of these before too long... better be before long at my age!... my idea right now is to head up to Quebec's Route Verte, so I can avoid transport costs. I hear the B&B's in the small towns are plentiful and economical.
Yeah, support from the folks at home, that is surely the biggest challenge!