First off. I am sorry about your situation. Some pics, and more detailed info would help.
My present TT has FOUR 42 gallon grey/black tanks, and ONE 42 gallon fresh tank. I routinely travel with them full. And over some really rough roads to boot. We load very heavy as well. We even mounted a 5 cubic ft deep freeze on the rear rack.
We boondock in remote locactions for extended periods. If you don't bring it, you can't realistically get it.
My Lippert frame is VERY stout. The welds are top notch. (I am a welder, so I know what I am looking at)
This is our 3rd TT, and the first Lippert framed one. It is also the only one that I have not needed to weld up some repairs on.
Now, as I have said before many times. Lippert builds what the manufacturer requests. Unfortunantly most of them are into light weight/low cost frames. Sabre paid up for a good frame. A REAL 10" I beam, 1/4" thick.