We're coming from southern NH...
Mass Pike to 84 West
to 87
to Garden State
to NJ Turnpike/95
...take 695 look around Baltimore (tunnel exclusion)
Going around DC you can take the beltway either East or West - not much difference except if you go East you can get a peek at the Capitol/Washington Monument.
Stay on 95 all the way to FL to I4 (Daytona) to FW!
We've gone straight through NYC before, but it freaks DH out pulling the TT, so we go the slightly longer, but smoother/easier way around the city and through NJ.
ETA - btw you can use EZ pass all the way to FL now. In NJ there are even high speed lanes where you maintain your speed and zip on through.