use of interior portable heater during storage

I've done it. But, only after using air to blow out the lines. I wasn't sure if that was going to be good enough so I left a electric space heater running in it all winter long just to be sure. My water lines are all inside the TT and I opened up compartments, and drawers, plus used a fan, just to be sure the heat got to where it needed to be.

This year I used the pink antifreeze method ; and ; blew out the lines. So, no heater running in it full time this year.