I wonder if you could pick the top off... or if they'd let you.
I know it comes off, but it's a job as I understand it. They probably wouldn't let you in with the equipment you'd need.
Does anyone know if they used the standard blazer frame for those? Then added a extended portion? Did they use a short bed chevy truck frame? I ask because the rails stick out under that bottom section on the back a bit.
-W
p.s. read more about it:
http://www.blazerchalet.com/