Interesting concern.
Your due diligence when purchasing is still required. No different than any other purchase.
The house is really not much different than any of your other RVs with respect to the electrical and mechanical systems and the chassis and drivetrain is just your basic ford or Chevy.
It’s evident that budget is a real concern (not downplaying that ) so IMO, don’t think what’s the max you can spend, but rather how little you can spend to get something acceptable to you. Less you spend, more you have in your pocket afterwards and consequently the less impact financially some repairs will be to you.
