It's nearly two years since I bought my 5W and I'm still finding issues. I'm leaving in a few days and because of weather and ability to access the wheels I took my trailer to a local trailer service center to have the bearings and suspension greased. It's a good thing too. When the tech took out the left rear outer bearing he found the rollers scored. It must have been some dirt or contamination as they had not been opened until then. The bearing and race are replaced and I'm traveling with fresh grease all around. After the blow out last fall I really don't want another failure.
If you are near Philadelphia, Pa. Cargo Trailer Sales in Lansdale, Pa. is great for suspension work and inspection. Every time now I drop off in the morning and have it back in the afternoon.