Enclosed trailer question

Just my opinion, but I never like to use anything that is "enough" for the application. I always go for "more than enough" for the extra margin of safety.
i.e.: * 12,000 trailer rating but keep it around 10,000 loaded. (28')
* 16" tires w/6,000 lb axles instead of 15" tires and 5,200 lb axles.
* One ton dually instead of ANYTHING smaller.

A 3/4 ton truck will have better brakes, better rear gearing and strength, weigh more so the trailer is less likely to push it around, etc. The truck and its parts will last longer and be safer. If it's replacing a dually, then size-wise it will be more like a 1/2 ton anyway, but better equipped. It's too easy to go overweight. It always surprised me when I weighed my stuff at the truck scales over the years.

Hemicop is on the same page as me.