Hi
A *lot* depends on just what you will have along as you head out. If it's always going to be just you and nobody else, that's different than a family of six. Bringing along an ATV and a couple of dirt bikes is different than an empty bed on the truck.
You *can* get by with a 150 /
1500 sort of truck *if* it has all the right options and you don't have much to bring along. On the other end of things, with the right (wrong ...) combination, a 350 / 3500 truck may be challenged to do what you are trying to do.
If you fill in some of your "member info" we could better guess where you might be towing. Pulling along the flat gulf coast is very different than bumping over the Rockies on a regular basis.
Next up is how much experience you have towing. I'm guessing not a lot, but that could easily be wrong. In general, it's better to go a bit "more big" if you don't have a lot of experience.
Pretty much any modern truck will have a trim level that includes power seats / pedals / steering wheel. From what I've seen, they will accommodate just about any sized driver.
In a normal market used trucks would save you some money. This is not a normal market for trucks. When that will change is very unclear. Some have suggested that this is the new normal through next summer. There's no way to know ....
Good luck !!!
Bob