For what it's worth my wife's Aunt and Uncle owned a 97 PSD and 01 Cummins. Both trucks were stock and both configured the same. Pulling trailers in the mountain the PSD walked all over the Cummins. The Ram did a front flip which ended it's life and the PSD got traded off with a tad over 300K miles. They owned both trucks at the same time.
The V10 would work but it's a gas guzzler like many others have mentioned. The 7.3 PSD would be a great option but you will compromise ride quality compared to your toyota. You can find decent V10's for fairly cheap while you will pay good money for nice 7.3's.
Best advice find a dealership that has a V10 and a 7.3 and take them for a test drive. Keeping a 7.3 on the road will cost more than a V10 but the trade off is fuel mileage and pulling power.
Yes, the 4R100 trannies behind the 7.3's are not the greatest but some are better than others. For example the 340K mile F250 is on it's third tranny while the 02 Excursion is on it's original tranny and works great. 00 X with 270K miles original tranny, dually made it to 245K hard miles on it's original tranny, burnt up at land fill.