Another reason for renting is to see what your TV does. My first F-150 was rated to tow and had a decent Max cargo for a 5000 lb. TT. Unfortunately when I started to travel, the poor 200 hp. V6 was over its limit.
So we kept the speed to 55 and 60 mph. on the flat and 50 to 55 mph in the Ozark hills and allowed for the sluggish performance when pulling out etc. It was annoying but we still managed 10 days of sightseeing.
When it came to a replacement TV, I purchased an E-Boost F-150 with 356 hp. I pull a 5000 lb. 25 ft. Dutchmen and I am at or a bit over the max cargo limit of 1400 lbs. when loaded. I looked at an F-250 but the added cost and maintenance was not worth it, since it is my day to day vehicle also.
A TV and TT are a serious investment. Try before you buy so you can determine what you like.