I don’t know how many still use it today, but if and when I need a new roof it will be single sheet aluminum… key words being single sheet…
The two I have with aluminum roofs are a 1990 and a 1991 respectively… our climate has harsh winters and a lot of hot sunny days and cool nights in the summers and a lot of rain most of the year… maintenance on these roofs is almost nonexistent…
Over the years I have had a least 6 trailers with single sheet aluminum roofs and not once have I had a leak… calking is no different than the rubber but with the aluminum roof the types of caulk are less limiting and easier to clean, apply, and remove… all I can say is I have never had roof leaks caused by hail with any roofing material…
It’s not used as much today because of its cost and rubber instillation is much easier to do…
None of my comments are meant to take anything from rubber roofs, they are similar in many ways but they wear out quicker than aluminum…
I won’t even get into TPO...