I think we are part of a "club" - though one we'd rather not have joined. I don't know if I'd call it "abandoned," but the thing about axles is that they are big and heavy, and probably need special shipping. Ours certainly did to get to Dubois, Wyoming! (Not to an RV dealer, either, but to a gas station/mechanic shop.)
Our first problem with our hubs came when the trailer was a year old. I can't remember if we had had the bearings repacked before that. Incidentally, our owners manual said to have the hubs serviced after a year or something like 2500 miles (!) Anyway, if we hadn't had a truck service shop nearby when we blew that hub, we would have replaced an axle then, but he was able to get the "axle doctor" in his area to rebuild the spindle. This second time we blew the hub was near the end of a 5000-mile trip, right before which we had had a local dealer repack the bearings. We learned later that dealers often put their most junior guy on this job, and therefore they often are not done correctly. (Learned this from a mobile RV tech last year - we were just starting out on a camping trip and I noticed grease leaking out, in liquid form, from under the cap on one of our wheel hubs!! Called one the campground recommended and he was a gem! He redid two of our hubs while we were camped there for the weekend, and checked the other two - the ones that had been done by the shop that replaced the axle - and said they looked just fine. He said many less experienced workers tighten the hubs too much, making them run hot - that was the problem with ours, and it had already done damage to the bearings.) So your experience - 1500 miles & 4 months after the last wheel job - doesn't surprise me.
I do wonder if FR putting 3500-lb axles on their larger trailers & 5ers isn't such a good idea. I'm sure it saves weight, but I think those axles are right at their limit. Not sure if Dexter or Al-Ko axles are better, but I'm hoping we fare better with the Dexters on our new rig. (And if that mobile tech is still around, I'm planning on going to him for wheel service! He did say he might be moving to AZ.