GoPack wrote:
Both are 110 psi tires, 14 ply and take the same size rim. #1 has a little more tread depth. It looks like both are 'L' speed rated (75 mph), which I do not care about, although I do like the increased margin over the speeds I normally run.GoPack
Your #35 in trailer users who have has issues with their Maxxis ST8008 tires.
The 75 mph speed rating is more about a the tire ability to cope with heat rather than one can drive faster.
The Sailun S637 came as a multi position LT tire when they first hit the USA market. Due to high tariff charges on P and LT tires Sailun re-id'd them to a ST to avoid high tariff costs.
I have a set of the LT S637's on a triaxle trailer which were bought during the transition from LT to ST....which both carried the same Sailun part number for a while till the LT were purged from the system.
Regardless your getting a true medium duty commercial grade all steel tire.
As others say #2 makes better sense as a trailer unlike a truck can have too much tire for best long term service. Good choice.