I recently purchased a new TT that weighs 6800# dry. I am currently pulling it with my '99 F150 which does ok but I am going to be truck shopping early next year and am debating if I want another 1/2...
Move up to a 3/4 ton you won't regret it. You can never have too much truck.
Keep in mind, based upon the typical RVer your next RV will be even bigger/heavier so with a 3/4 or even a 1 ton you will be ready for that next RV purchase.