Slow going. Weather has not cooperated and some other projects had to get done. BUT am about ready to use special $$ 3M adhesive on the Poly tank to attach some ABS that I can then glue standard fittings to.
I am still interested in a backup plan which would probably mean a new tank. The problem is Camping World says that there are no replacement tanks available and aren't even any drawings or supplier info available. Their only suggestion was to order a custom tank which would take 4 to 6 weeks. Sounds like they just aren't interested.
I note that there are a number of smaller 21' to 24' Class-C with identical bathroom layout and similar size tanks (22 to 25 gal)
What I can't find out is who makes tanks for Forest River, Thor, Jayco or 4 Winds.
I can't believe that none of these companies are not making RVs right now.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV