To the OP. Here is a couple of suggestions. One, try to do as much research as you can on what payload, axle and tire ratings mean. Research what spring rates ( rear of truck primarily ) are and how they effect set up.
Research as best you can how these different ratings are arrived at by manufacturers.
And very importantly, absolutely come to a complete understanding of how weight distributing hitches work, and the importance of getting them set up correctly. You "must" learn to do this yourself, as the dealer likely will not get it right. The same truck and trailer hitched together with this critical hitch system adjust wrong, vs correct is a night day difference in on the road.
I own and tow four different trailers, and tow with three different trucks. Frontier ( yes the "little mid-size", with 4.0 and six speed manual ), Silverado 1500 (6.2 six speed auto )and F350 dually (diesel with five speed auto ).
All can be set up to correctly and safely pull and carry loads within their capabilities.
Some people may tell you that a certain rear end ratio is appropriate or less appropriate for towing a load. What they seldom say though, is how this ratio in the differential works along with the ratios in the transmission. The transmission and differential work as a team to multiply the torque of the engine to the driven axles. If you are not sure how that works, research that as well.
For instance, her's an example: the overall ratio to the drive axles is nearly the same on a Tundra vs a new gas Titan. And yet the Titan has a 3.36 rear gear and the Tundra has a 4.30.
Some of the less informed may assume the Tundra would pull better "because it has a lower rear gear". To make this assumption is a failure to understand how the transmission ratios work. So again, as the end user, it's to your benefit to figure it out for yourself.
