Ford 7.3 power stroke f250 any good?

I had an '01 7.3l extended cab long bed. Towed our 27 foot 6100 pound dry trailer just fine for four years. Should be about where you are loaded. Only problem was gearing when towing. If you don't mind a stick it worth getting one because there is one extra gear basically if you don't count the granny low. It did lack power, you really had to get it wound up for the hills. Fan came on alot after the hills when it was hot. If was however a very reliable truck always got us there. As some have said the trannys suck. They lack cooling. I put in a 6.0l tranny cooler which cured that. 7500 pounds won't stress the tranny much. Just keep in mind it required just as much or more maintenance on a low milage truck. I diligently changed the oil every 6 months being a low milage truck. Fuel filters every third. And changed the tranny fluid every year. Trucks with low miles may have sat for extended amounts of time allowing the oil to breakdown. Fuel filters that are not changed or drained of water can be detrimental to the injectors. Also oil starts to leak from sitting. Good luck in your search, sounds like you've found some good candidates for your next tow vehicle. They are VERY reliable.