Hi Mike,
Came across your post as I too have been searching high and low for a Jeep tent. I FINALLY got to the bottom of it and why they are virtually impossible to find. Turns out the maker is Columbia and they no longer make the Jeep tents. They do however have a similar tent, though smaller, called the Cougar Flats II. It's 15x10. I'd love to find one like it but bigger myself but it looks like if you want a Jeep tent, you have to find a used one in good condition. That's what I'm trying to do. Try Craig's list for your area. I've seen several "WANTED" posts for it on Ebay so it seems we're not alone in trying to locate one of these awesome tents! Best of luck!
Sian