I bought my current MH 16 years ago when I retired, I kept track of all my expenses including mods and improvement like headers, FF muffler CAI etc, repairs like autopark failures,front end repairs, hyd jacks, fuel pump replacement, control boards etc and general maintenance like fluid changes( oil transmission,rear end), tires etc. To date it cost me $21,348 in total in 100,000 miles of travel. I have done most of the work myself except for the front end,headers and changing the fuel pump while on a trip. The biggest cost was the IFS front end which was about $7000 most of that was caused by a shop installing the wrong ball joints causing two accidents. The total cost was $1334/year. If you have a newer MH with a straight front axle most of those front end repairs would go away so I think a better estimate would be more like $1000/year. Almost every trip something had to be fixed. Another way to look at it is if you bought a brand new MH you would lose more than $21,000 in depreciation in the first year alone with multiple trips back to the dealer for warranty work.