Thanks for the input so far. I guess I need to keep my options open. I am not at all afraid of a vehicle with 100k miles, if it has good records, but at the same time I know there will always be things that need repaired both on the chassis and also on the house part.I figure if it has 100k miles the house part has probably been also used alot and will be showing age and start needing to be reconditioned.
As far as towing I may tow a boat occasionally, it is about 3000lbs so should be fine on the chevy or ford chassis, I prefer the chevy from what I know, but am open to either for the right price and layout!