How much engine to tow 5500 lbs?

This is good stuff to know. I had a 5.7 in a Tahoe and at best it was Ok but since it is out there I included it but I agree it won't be my first choice. I have seen a couple of the Ford V-10's on the lots and plan to drive one this weekend. Lots of 5.3 and 5.4"s so knowing how they stack up is important info. 6.0's are about as common as the Ford V-10 but I have not seen a Dodge V-10 even listed anywhere. The only 8.1 I have seen is in a 2500HD crew cab with a fairly solid body but it has 246,000 miles on it for $5000. Just not sure about that many miles. It seems 3/4 and 1 ton trucks tend to run much higher miles than 1/2 ton for the same price but I assume it's because most are bought as work trucks and not grocery getters. 1 ton gassers seem to be priced about the same as 3/4 ton. I saw a 1 ton listed with a 5.4 fairly reasonable but I didn't even go look at it because I figured with the weight of just the truck a 5.4 wouldn't get the job done. I haven't driven a Dodge 5.9 yet because up here in Minnesota rust is a problem and I haven't seen a Dodge yet I couldn't see threw. I don't need to win any races but I do want to be able to go down the freeway at 60 mph without the engine screaming for mercy.