lost like fell out while driving? lots of threads about bent support arms and driving with full tanks. I opt to drive full some times but have been lucky so far. You should be able to use your unit and not have to worry about things like that.
This almost happened to our 2015 275CKX wildcat. I noticed that there was a bulge under the camper. So I took off the sheet of plastic and it looked like the tank buckled in the middle. I contacted forest river and they sent me a new tank free of charge. When I went to put it in I seen the supports were not tight up against the tank so I relocated them so they were tight and added strapping from one corner to the other corner of the tank. Now I know it will stay in place. Seems like the old saying is true. If you want something done right do it yourself.
2012 Ram 2500 4X4 Short bed Diesel
2015 Wildcat 275 CK
There are several places that sell the tanks. Just search for RV water tanks and you'll find plenty.
You'll need to measure the area that the tank fits in and get one that will fit.
Your unit had 60 gallons of fresh water capacity, so it probably had a 52 or 53 gallon tank. (Yeah they count the water heater tank and everything else as fresh water capacity.)
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!