op wrote:
Other than the 15s raising the overall height of the trailer maybe by 2" and the overall weight increasing due to the heavier axle, what benefits do I gain by going with the larger wheels/axle? One advantage I see when it's time to replace tires is the ability to go with a lot heavier rated tire with the 15". Your comments appreciated!
Every single axle trailer (boats/RVs/cargo/car hauler/etc) and tandem axle trailer under 7k that came with 14" tires and wheels I dump them on CS for the lawn service trailer types.
I go with a 15" trailer wheels and P or LT tires as neither carry speed restrictions.
Benefits of upgrading to 15" for my use is a larger diameter tire = a smoother riding trailer/less heat on the tire and bearings from tire speed/gets me away from using ST tires and their issues/several 15" LT and all position tire options.
I would go with the unit with the higher rated axle with 15" tires/wheels.