Re: 2000 Excursion Limited
The Excursion won't have any trouble towing that. 9K is the max weight, so I'm sure the trailer base weight is only around 6.5K plus whatever you want to throw in it (fluids, propane, gear, etc) you'll still be under 9K.
My 5.9L V8 3.92axle Durango tows 6.8K with ease. I can imagine the V10 Excursion will be similar as far as power to weight ratio is concerned.
Don't worry too much with tires. As long as their a LT (light truck tire) load rated "E", you can tow anything. To put it into some perspective, you'd have to put 2100lbs on the hitch before you'd have to worry about your tires. Just be sure they're at the proper air pressure as well. Not having the diesel engine lowers overall vehicle weight, so you have more payload.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!