New to towing a Travel Trailer

[TXWolf]

After much deliberation, the wife and I went out and bought a 36' travel trailer last night. We were wanting something much smaller, but we KNOW we're gonna have to take our daughter, her boyfriend and our 2 grandkids with us when we go to the Coast. So I have a few questions for those of you that have experience with towing one of these.

A few quick notes:
The dry weight of this travel trailer is 7300 lbs. We are getting an equalizer hitch and electric brake controller installed.

First off ... just how bad is my MPG going to get. Thanks to Corey's recommendation, Bill made a custom tow tune for me when I upgraded to the Gryphon. So I'm hoping that will help a bit.

How hard is it to back one of these things up? I haven't pulled anything with my newer truck (2008 with a 6" lift), and the most I ever towed with my '97 F150 was a small 7' dump trailer filled with crushed granite.

How will having a lifted truck affect the towing?

I'm sure I'll think of a few more things after I get the trailer home. We're planning to take it to an RV Park in Port Aransas in August, to be right next to the beach. So I guess I have a little bit of time to practice!

Thanks in advance for any help I can get from y'all.