Expedition or Excursion $6000 budget

I've got two V-10's one in a Excursion another in a 2000 3/4 ton crew cab. The truck has the most miles 205,000 and the Excursion 139,000 miles. I had my mechanic change the plugs and coil packs on both vehicles when I bought them. You can go to the FTE forum to see the longevity of this motor. The transmission is the weak link if your towing heavy. With what your towing it should never be a issue. The Excursion is a far superior tow vehicle but very large. Some of the early models were famous for spitting plugs but I've never experienced this despite both being 2000 models. My mechanic follows proper procedure for changing plugs. I would not get the Excursion with the small motor (5.4) personal preference.