If I were a new potential owner I would enlist the aid of an experienced, mechanically talented owner.

When we bought our first coach Don Hoffman, a great converter in Clarendon, PA did our coach inspection, and I followed him around like a puppy dog.

He worked virtually the whole day, operated every switch and button, drove the coach, and by the time he completed his inspection we both knew every single device was working.

I did my own inspection on our current coach but I had 15 years of ownership and about 10 years of doing all my own repairs and maintenance behind me.

What I would not do would be to allow someone to do the "inspection" without looking over their shoulder and making sure they looked at everything. On the vintage coaches you are considering it is unlikely everything will be perfect, but you still want to know what might need attention, or what might not work so you can attach a value to any required repairs.