You will get better fuel economy with a TM, but don't expect miracles. You're not going to get close to your 28 mpg. You're still going to be towing 3500 lbs + the weight of all your stuff, passengers, propane, etc etc. It's surprising how much the weight adds up.
As for braking, yes, the weight of the TV is important, but a good trailer brake module that adjusts the amount of braking goes a long way to safe braking.
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