What is your cost of maintenance

We purchased a 10 yr old gas 36' coach. Had them go over everything and service the generator, do oil change etc. We also put new tires on, had it aligned and in the first year, resealed the roof seams, all the vents,etc. Replaced 2 circuit boards and put a front stabalizer on it. So -- our first year maintenence cost was are $3,500. (We did resealing, circuit board replacement ourselves) but, we have had it 3 1/2 year now and other than oil changes, change filters, lube stuff, tighten screws, we have had no other expenses. DH does most himself and we wash & wash ourselves at least 2X per year.