Go as light as you can and you will be a happy camper. Because you can tow 6200lbs doesn't mean you have to. Can you find something in the 4000-5000lb range you like? What about the 3000lb range? Even better.
Figure out the features you are wanting and start looking at that. Don't start looking at weights and such and then try to figure out something in your max range. Once again, the lighter and smaller you can go, the easier and more comfortable you will fill towing it. Plus the smaller it is, the more options for campsites you will have.You can fit a 20' TT in a lot more campsites than you can a 30' TT.