I have to agree with Hammertime also.
one of the guys I race with bought a motorhome on a Freightliner chassic 2 years ago, it was a private sale. Lots of pictures, list of services that had been done. He gets on a plane, flies 7 hours to see the unit, drove it in town and on the highway. Was ready to have the money transfered over to the guy. The last things they had to do was take it the local Freightliner dealer and have the unit go through a thorough inspection. They also took it to a RV service shop do a once over on the fridge stove holding tanks etc. Freightliner gave him the report and the RV place did like wise. The unit had a couple of items that would require attn. but nothing major. They did the deal and 3 days later he drove the unit home.
Before they even started on the price, the guy selling the motorhome told my buddy if we can't agree on a number. I'll pay you for the inspections you had done. That way I can show the next guy what the repairs were and that I have fixxed them.
In a private sale you have to be careful and 70K is a lot of money