We have a newer version with the slideout bedroom and love it. We have 4 tanks being a freshwater, galley, gray and black water tanks. This would show up on your panel above the TV if yours is the same. All tanks are supposed to be about 35 gal or so but that usually includes pipes and such. The difference I am seeing is that they have swapped the shower and sink arrangement if I'm looking at the pictures correctly. Not sure if they added the galley tank later.
The converter should be under the refrigerator behind the fuse/breaker panel. For using the electric side of the water heater you have to have on the switch outside at the water heater bottom left behind wires and tubes. You could leave that switch on and just turn off the breaker on the breaker panel inside but be sure to have the heater full before turning it on and don't forget to turn it off. The switch on the panel is for LP use only, but you can use both for quicker turnaround on heating your water.
I have made a few mods on our TT that might interest you (or not). Just look under my account for the pictures or search my posts. We love our TT but haven't been able to use it much yet.
The small cabinet behind the sink, is that added on or does it look factory? We just have more counter space there. Hope you enjoy your time in the new camper......
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