The big white thing has been referered to as the Great White Whale. It is a 1973 GMC citybus that has been converted to a motorhome. I drove it out here from Michigan, and it's been extremely useful as a construction shack.
This one may look familiar to many people. It's a 198? bluebird 40' schoolbus. This was my moving van and main storage unit since I left Michigan. It gets lousy mileage (about 4 miles/gallon), but is good storage. (Especially since I removed almost all the seats.)