Honestly. An Expedition will tow the TT you are looking at just fine, with power to spare. As for buying a TV for the next TT. IMOP a totally useless thing to do. Why? In all likely hood. You will keep the TV less than 10 years. Most trade long before then. And there is a great chance you WILL keep the TT more than 10 years, as most people don't trade TTs all that often.
Also. Travel Trailers are in fact getting lighter all the time. My 2004 27' TT weighed 150lbs MORE dry than does my 2013 31' TT. So even thought you may want a larger TT in 8-10 years. There is a great chance it will be lighter than the one you buy now.
and there is a even greater chance that in 8-10 years you will already have a new TV.
