To answer Ken's question first. The SUV option accounts for over 80% of what we build. Only a very small percentage of those customers are getting it for more off road ground clearance. Most are getting it because they like the trailer sitting a bit higher, especially the kitchen.
As for behind a car or truck this does not matter unless the aesthetics of the tire matching concern the customer.
How tall are you Tom and Gayle? This will really be the biggest determining factor. Like Bob and Deb said, they are both 5' 9" so it will work good for them at SUV height, but it would work good for them at street height too. Ken is taller, about the same as me. For me, I hit my head on the hatch on a street height but do not on a SUV height. For those who are even taller yet, say above 6' tall the SUV then becomes pretty much a necessity. For those who are shorter, say 5' 2" or something, the stove becomes to high up on a SUV so the street height is a must.
Cary