Trailer axle seals short life

[t700]

Thanks for the advice.
This is a 2007 Utility Reefer that was built from the factory for super singles and can not run duals. Tire wear has been good and we have a spare super single on rim on a tire rack under the trailer in case of problems.
Most trailers who run super singles have been converted from duals.

The original bearings appear to be Chinese.
We have replaced 2 sets with: Timken set#413 HM212011 and HM212049
set# 414 HM218210 and HM218248
These are taper bearings
National seal 370025A or Stemco Voyager Seal
373-0143
May try the SKF seal if we continue to have problems

T700