Rock wood minilite

We bought this trailer from a previous owner this Spring,we were looking for a smaller trailer as it is just the two of us now.l love the trailer and now that we have camped all Summer in it, I love it even more

My problem with it is that it does not vent properly from the waste tanks,first it was the black tank which my husband snaked the pipe with no obstructions, it is the very worse sewer smell ever like a H2S smell. The next trip out it was the grey tank and kitchen sink and the last one was the bathroom sink. It is very distressing and I need to know if there have been any recalls or is anyone has experienced the same thing

2023-Forest river-Rock wood mini-lite-25ft

Exterior: Fibreglass

Interior: Lino,2 slides

Tow Vehicle: 1500 Dodge Ram