our 60 trdwnd had the aluminum round tank ,others have the galvanized one.
i had a stainlees steel tank built for my trailer from a local fabricator that works with stainless steel and aluminum .Well ,the old tank I had was trashed
inside and had pinhole leaks where it touched the floor ,but alas ,no floor rot
.Most folks are going with the plastic tanks ,Inca plastics is one maker and
there can be some used ones found also ,try the (search) function using
water tank replacement for a title.the plastic tanks and a new water pump seems to be the best choice.I wouldn't go back to an aluminum tank ,but it is lighter than the stainless steel unit .Others here will have good ideas to help you also.
Scott of scottanlily