We pull our 3625 Big Sky with a 3500HD srw. While I still need to weigh the trailer (truck has been weighed at the transfer station after a yard waste run) We have had no problems with going over mountain passes.
Stability is just fine. But I have never had a dually.
We get about 12 to 13 mpg while in towmode with the exhaust brake on.
I would recommend you get something bigger than a 2500. If you can find one or afford it get a dually and remove your doubt.
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