Durb wrote:
I believe that trailer has 225/75R15 tires on it stock. According to my calculations the radius of that tire would be 14.14".
235/80R16 has a radius of 15.4" and would give 1.26" of lift. Your tires would be 2.52" closer together and you would have 1.26" less clearance above.
235/85/R16 has a radius of 15.86" and would give 1.72" of lift. Your tires would be 3.48" closer together and you would have 1.72" less clearance above.
These are unloaded calculations. The lift dimensions will vary slightly under load but the other clearances should be good.
I went through this last year with my setup and in the end I upgraded to taller tires and also had a suspension shop put the leafs on the highest hanger setting, in all I gained 3" worth of height and leveled out my rig. I put over 10000 Km's on it last summer with this new setup and I'm extremely happy with it.
before with the lowest setting on the spring hanger and 225/75R15 tires:
after adjustment and LT215/85R16 tires:
