We have the flap on our 2720SL (with the slideout couch).
Cycle guy is right - that is a 3326, the heaviest TM ever made. A romp through the Wayback Machine would uncover the dry weight.
The original purpose of the "cubby" cut into the front wall of the slide was to enable the slide to pass over the upright propane tanks. So this TM might have upright tanks. When TM changed to horizontal tanks for the slideout models, the cubby was no longer needed. However, it didn't disappear for about 2 years. Our 2002 2720SL TM had horizontal tanks, and also had the cubby. So this TM might have horizontal tanks. Unless you can see into the cubby, I don't think you can tell which.
Bill
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