I'm not blaming the EZ lube fittings for my seal leaks. It could very well have been that all four seals were defective in the first place. This is a picture from my 10 month old FW that has EZ lube fittings. This is after approximately 10K miles. I had not used the EZ lube fittings to inject grease, but it is possible that the delivery driver did. There were two indications that there was a problem. 1. I noticed grease on the inside of the wheels. 2. My braking was not adequate, even with properly adjusting the brakes.
I cleaned the drums, replaced the brakes with the self adjusting variety, hand packed the bearings, and replaced the seals with new seals from e-trailer. I put a lot of miles on my FW, so I plan on pulling the drums once a year, inspecting the brakes, hand packing the bearings, and putting in new seals. With that in mind, there is no reason for me to use the EZ lube fittings.