8 to 10 years will probably be the point where parts starts failling. If the MH was neglected anything can happen. If it has been taking care of, anything can happen also, but most likely worn parts where replaced when needed. Repair bill goes up quickly on those MH especially if you have all the maintenance done by someone else. A radiator cost $4000+, a turbo is in the $2000 to $5000, a cracked windshield will start near $1000, if it is a full view more$$.
1. Maintenance record, if the sellers does not have any, do not buy it.
2. Check preventive maintenance like: Was the coolant replaced? The transmission oil replaced? Differential oil replaced? All filters replaced at the proper time?
2. A good inspection will cover the basic to know repair needed.
2. If tires where never replaced = $3000
3. Brakes normally do not fail on MH.
4. If suspension is good, I do not see the reason to replace good working parts.
Good shopping!