I question that weight for that TC. Our 910FBS has a dry weight of 3600#. All loaded we're at 4300#. We upgraded our 3500 SRW to a dually for safety and peace of mind. Our TC travels well, but it's heavy.
That weight could listed before any options are added. Add 1000# for contents, water, people etc, and you'll have to be worried over every extra pound. Not fun.
Lots of people on this forum have the 19.5 tires and rims. They seem to work well but are $$. Add that to your new SRW plus possible other needed mods and you're looking at several thousand dollars in mods.
Something to think about.