This just popped up on the local Craigslist... Looks like it could be made into an EPIC track rig: http://southbend.craigslist.org/rvs/4179059532.html
Coolest rig I've seen at the track was a few years back at CMP. These guys had this thing registered as an RV, legally they couldn't drive it with out the trailer attached or it would no longer be considered an RV. They showed up with what seemed like 30 bikes.
YES! I sent that to a few of my friends. I've always liked the idea of gutting a bus and that is SO close to being ideal for me, haha. Sadly parking a school bus in downtown Chicago might be a bit tricky.
I have a 6x12 with a pop out queen size bed. If you have been to southern events you probably saw it this year. I can tow it with a v6 SUV, and get pitiful mileage, but it works. Its amazing how easy and relaxing driving 60-65 mph in the right lane can be. You never get stuck behind any one! But I do wish I had a better towing vehicle. With the bed popped out, the trailer feels like it doubles in size, even with the bike in it. I don't think I would ever go bigger. I'm actually thinking of going smaller in the future.
The right size is the size you have.... Cause no matter what you get at some point you wish for a smaller/larger rig.... Pick something you can tow safely and tailor your stuff to fit. You will grow to the size of your rig... I have a 7x16+V and if I car pool with 1 other person I'm full. Pit bikes, spare parts, tools, gear etc.... you get it.