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If it's a Dexter hub, "Dexter" is stamped on the hub. Other makes you may have to measure and make a guess. But there are only a few manufacturers and a limited range of sizes that support the wheel/tire size you have.
Replacing the entire hub assembly on the side of the road is not all that simple, because of the brakes and brake wiring. Have you checked the mounting bolts for the hub to see if you could even break them loose?
But realistically, as small and light as the early A-frames are, unless you are severely overloading and/or NOT doing ANY maintenance on the bearings, the chances of a bearing failure are minuscule. You are much more likely to have issues with tires or brakes.
Bearings also do not instantly fail - again assuming reasonable loads. Reasonably loaded bearings will go hundreds of miles without lube, or with water in the lube, etc. And they will get hot as they start to wear and break down, giving you some warning.
But for piece of mind, I recommend you hand repack/replace your bearings at a regular interval. If you don't know when they were last repacked, do it before your next trip - and make the trip worry-free. I use 3 years as the nominal interval for my A-frame. If a tire needs replacement or brakes need adjustment in the interim, I use that as an excuse to do a repack. On my boat trailers that got dunked in salt water, I simply replaced bearings and seals every year.
When you pull the hub to repack the bearing, you can tell what's going on. And when you repack, if you don't fill the hub with grease, it's a lot easier to see what has been happening the next time you pull the wheel.
I repacked the bearings on my 2019 A-frame this Spring (and had the tires balanced) just to give myself peace of mind that the factory did a good job (they had).
just my thoughts
Fred W
2019 Flagstaff T21TBHW A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
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