So I wasn't sure if this would be considered inside or outside so I just put it here.

When we first got our 2016 reflection used, our gray tank was cracked and needed to be replaced. Now our black tank split at the mold. (It looks like there are two clamshell like pieces, that are either melted or glued together and the glue/melt came apart). My girlfriend and our dogs travel around the country for my job so I use this camper as a house pretty much. Is there any reason my tanks are going out? I've had it for a little over 2 years now and both times have been when I'm on the road working. I use the campachem by thetford, and always drain them well before they are full.

I cant really find anyone else that has had it split like this. Any help is appreciated.