Like Les, we have had a pretty expensive year catching up on maintenance items and some repairs. We bought our coach exactly two years ago and went full time 16 months ago. We have driven it 15,000 miles in that time.
New tires, brakes, coolant change (to extended life), Transyn change and new batteries cost roughly $7,500, but should be good for 5+ years.
Repairs to generator: $2,000, but it looks like it is really fixed this time.
Repairs to Aquahot: $1200 (so far. This is an ongoing saga. I love it when it is working right.)
I am budgeting $500 a month for repairs and maintenance in 2016.
BTW, Speedco is a good place to get fluids and filters changed at reasonable prices. The annual ISM and Onan service was $335.
Home: 2003 Monaco Executive 43 SDDS, ISM