Yes the Excursion will tow well. Couple of things to check on a 2000 model year:
1. Some of the early EX's either did not have an external transmission cooler or a in radiator cooler (can't remember which) later models had both. Check and make sure the trans cooler line split at the radiator and go to an external cooler and inside the radiator. If not, might think about a later MY radiator and cooler lines that include both coolers.
2. Some of the early EX's came with load D tires. If the owner kept these upgrade to load E. Ford had a recall to upgrade the tires. The loading sticker in the door jamb could be incorrect because of this.
3. Be careful when changing spark plugs and BE SURE to torque them with a TORQUE WRENCH, not "feel." Use ONLY Motorcraft Spark Plugs / Coils (if needed) to avoid misfires.
4. I prefer to use 5W30 oil as the engine originally called for it. Ford in their infinite wisdom, changed that specification to 5W20 to please CARB. Interestingly modular engines call for 5W40 outside North America....
The 2000 MY should have the "better" Y-pipe in the exhaust and the V10's didn't have chronic exhaust manifold problems. Exhaust flutter noises yes but you might not notice them anyways.
My 01 needed no modifications to tow my 30ft bunk house all over the sierras. Have fun and happy camping....
2007 Fleetwood Avalon HW PUP
2001 Excursion 6.8L V10 3.73
2005 F150 5.4L
Gone but not Forgotten: 1971 Trailstar PUP, 2002 Fleetwood Wilderness Northwest Edition, 2002 Keystone Bobcat 280-EB