Id think gearing would be your biggest concern- 7500 ft is not a big deal if your TV is tuned (leaned out fuel mixture) correctly.
FWIW, I routinely pull a 3027 with a 4.0l V-6 Explorer- it has a 5-speed tranny and 4.1 axles and does quite well around here, 5000-9000 ft. I dont really notice the trailer much. Just lock out overdrive (going up and down mtns), shift down, when needed, to avoid lugging the engine. I try to stay around the speed limit in mountainous areas, no more than 65-70 on flat roads.
If your engine performance bothers you a lot at high altitude, consider a supercharger (not a turbocharger- they can easily overheat engine while pulling) upgrade to add more air/fuel to your engine.
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