I go along with Tenbear.
If you were to do most of the items it would be around(guess only) $3000.
1)Holding tanks don't need professional cleaned. They need to have some liquid dish soap and used.
2)0 I would not do anything except run the genset under a good load at least 75% of rating.
3)See if rig has maintenance records. Some V-10s had issues with getting plugs out. If they have not been changed, get it done.
4) Tires check them out.
5) Clean the furnace and vacuum out ducts.
6) Fluids change them all, don't forget to have brake fluid flushed and changed.
7) Good answer from Tenbear
8) Change them out. Don't forget the belts!
If you haven't bought the rig, try to get the seller to do some of it as a negotiated price.
