how much should I budget for this???

Tires will be about $700 apiece, replaced every 7 yrs..I've got 8 so I set aside $75/mo for tires. Oil change, lube and filters, (oil and fuel incl separator) runs $310/yr @ SpeedCo, so that's another $25/mo. Figure an air dryer and air filter immediately then with the miles you're planning on putting on per year, those will be a one shot deal. They'll run you another $350. $200 for filters and $150 for the install. (I won't get under my coach as I don't have the proper blocking in the event of an air line failure) With the above, I'd put my budget at about $1500/yr. Anything left over goes in the next yrs budget. Most of the "house" stuff you can fix yourself. I carry an couple extra 'sharkbite' fittings, 1/2" and 3/8" to fix any plumbing problems, an extra couple fuel filters and an extra drive belt for emergencies...Best of luck...Dennis