Get your bearings repacked ASAP after you figure out the cause. We had a stuck brake coming down a hill where we couldn't stop. Got it corrected and looked for a shop that could repack the bearings, almost made it but had a blowout 40 miles short. If you can't find a shop very near to you I'd try to find a mobile tech to do it. Btw it doesn't have to be an RV shop, we eventually got ours done by a tire shop that does big rigs as they had high bay doors, trailer shops that handle boat or commercial trailers are also an option.