Yes, there are number of TT items that may draw down a battery while in storage; LP detector, DVD player, phantom drain, etc..
If you don't have a battery shut off switch, I would either remove the battery or remove the negative cable from the battery post.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V