This won't help much, but some people tow much heavier with no problem, some can't tow 5000# without problems. Suspensions seems ot inconsistant between some but how it's equipped makes a big difference too. You'd be surprised at the differences from year to year. If it's one of the years without a rear anti-sway bar, that is a must for starters.
Personally I'd think the V10 would be OK but you have to look at that gears it has. I'd prefer a diesel myself, but I'm biased.

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2004 EDDIE BAUER EXCURSION, White, 4x4, 6.0 PSD
Eddie Bauer Premier, Trailer Tow Group, Cargo Group, DVD w/wireless, 3:73 LS, TC Skid Plate
Magnaflow Exhaust, Isspro gauges, V Code's, 285/75/16 Bridgestone Dueler Revo's