1980 Bristrol VRT Double Decker Bus, open top. It has a door on the other side, and has wheel chair access via a removable ramp and it has a Gardner engine.
The fully working bus also has 16 speakers, 12 upstairs and 4 down plus an amplifier and PA system so that tours can be given with a mic as well as music being played using an iPod or similar device. $85,000
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