Thinking about a Suburban, have a couple questions

[myyamr7]

I've been looking for a 71-72 Suburban recently and had a couple questions before I go crazy with the search. I need it to work somewhat like a truck, as far as getting a dirtbike, sportbike or ATV in the back. My concern is the height inside, and through the rear doors. Does anyone know the exact inside height from the floor to the roof? And also is it a little less around the back door?
I see they have barn doors, and also tailgate type doors, is the distance from floor to top the same with both types of doors?

Also, I know the c10 trucks quite well and know what to look for in them, is there anything specific to look for...or common parts that are hard to replace/rusted out in the suburbans?

Final question, what should I prepare myself to pay for a decent unrestored suburban? I know it depends on condition, but lets assume it needs the basics, rockers, some floor work, fender/door bottoms, etc

Thanks for your time