Bert, no there is zero rot. The supports were 3/8 X about 4” plywood rips on edge with a little 1x2 keeping them upright. One of them just sheared off on the ledger it was sitting on.
It was the one in the middle of the tank, so it was seeing the most weight due to the tanks propensity to belly when full. Tank is wide and flat.
Ya I thought I’d be eating my words about always using the camper off the truck.
It wasn’t too bad to repair, but.....
She’s all good now !
And about 10x stronger than it was