I purchased used Elkridge, 2011. Has quick lube tires... Was used to my Hitch hiker that had never lube and what they said was true..drove thousands of miles US., Guatemala, Mexico and never a problem. Past experience with other 5th wheels...had tires catch fire, burned up axel and it fell off, etc. No have the quick lube and wondered if I still need to have the bearing checked and packed...and if so what type of lube do I use.