I have a small boat trailer that was imported from taiwan (1993). Both tires have play in them but they don't get hot after a 180 mile drive. I pulled the cotter pin and removed the big nut to get to the bearings but they won't slide off like i was expecting. Both wheels are the same...the hub moves in and out about 1/8 inch but i couldn't even bang them off with a sledgehammer. I thought about paying about $100 for a puller, but i have a feeling that i might need to replace the whole axle. The axle is only about 12 inches long. It attaches to an open channel. Should i try a puller or are the bearings not designed to come off?