I've got a 2006 original trailer that came with a STRATOS 294 Pro XL...single axle...oil bath hubs...I would like to get a spare hub complete with bearings, racers, seals, etc. in case something happens on the road and I need to do a "road side" repair...what's the best way to figure out what hub and components I need as a replacement without draining the oil in hub and pulling everything out...probably will just use grease for the spare and not oil....Thanks