DW and I just spent three and half months in Fl in our fifth wheel. During that time I made the following repairs: super glued a strip of the counter, replaced ceiling light, repaired dinning table l...
There is always something to be repaired, maintained or upgraded.
For us the major expenses have been running gear upgrades. Things like spring hanger area major modification, spring upgrade from 6 to 7 leaf, blingy aluminum wheels, bearing & brake replacement & the usual tire replacement as needed.
Inside the only big item has been a fridge replacement.
Spread it all out I guess it is around $1500 a year average for parts etc.