I bought my Class C motorhome brand-new in 2012. My biggest unexpected cost has been maintenance and repairs. My costs are probably more than some people because I am not handy, being in my 70s and traveling alone. Anyway, here are my last few year's rough expenses for maintenance and repairs. This figure covers things like oil changes, new tires, truck washes, house and vehicle batteries, new window shades, and things like water pumps and water system filters. I am a full-timer and have driven 152,000 miles in almost 9 years, so I do wear things out.
2014 $1,700
2015 $2,200
2016 $5,570
2017 $6,050
2018 $11,000
2019 $2,400
2020 $4,020
The biggest costs for 2018 were for major slide repair, damage from a blown tire, damage to electric steps from hitting a large tire tread from a cement truck, four new tires, new brakes front and rear, a set of coach batteries, and having my upper kitchen cabinets reattached when they started to come loose.
This year so far, I had some roof cracks fixed so they would not leak, had leak in toilet fixed, got a new windshield because of a crack, splurged on a new backup camera, and one oil change. I still have an electrical problem right now with no running or tail lights, and just today had to pay someone $190 to remove my shredded awning which got damaged as I was driving in heavy wind this morning. So I need a new awning and probably will have to buy several tires this year at about $220 each.
These numbers may be shocking, but things in a motorhome cost more to fix than they would at home and are also often harder to fix than a home equivalent. And, I drive a lot, plus I cannot do any repairs myself. I do not tow, so I do not have the expense of a second vehicle, which helps my budget.
My point is that you need a budget for repairs on any motorhome, unless you are really, really handy. But I did not go into this to save money on housing--I went into full-timing because I wanted to explore and travel the country. All the national parks and beautiful places I have visited--priceless.