This is pretty clearly a potential problem in certain, but not all, trailer models.
It would not happen in my 1707T model, but there IS the potential of destroying the TV/DVD screen if it is left down when closing, and, as I recall, if the kitchen faucet is not over the sink, it might contact the upper cabinet when lowering.
And, I've found that the shower curtains can "catch" on the toilet flush handle (and tear) when raising the top unless they are moved so that they don't touch that device when the top is lowered.
Bottom line to any new owner - do a thorough survey inside (and out) to see what might interfere with proper operation.
- Jack