I have an Eagle brand sled trailer, 8 x 10 tilt aluminum.
Couple opinions of mine on that style of trailer.
1- Unloading sleds sucks without reverse on them. I'm as gung-ho as a teenager but dragging a 500lb sled off the trailer backwards isn't exactly fun at 0 degrees.
2- Loading isn't bad if you can get the trailer to balance on its own. Sometimes it won't so I catch the trailer under my ski tips to hold it down, then run the sled up.
3- Add ski runners and traction mats or some kind of track traction material to aid in loading.
Other than that, I love the trailer. You just have to know some of the drawbacks going into buying a straight up tilt bed trailer.
Another thing to consider is highway travel. How far do you pull your sleds? How often? On salted roads? Etc...
This is wear a cap becomes nice. Salt shield is good but I would take it to the next level as well and that is complete sled protection. I burned out a voltage regulater on one of my sleds. Dealer said it was corrosion, more than likely a result of road salt. I trailer alot. Anyway... not a cheap bill when you fry all 3 halogen headlights, the speedo & tach light, and the taillight along with the voltage regulator. Salt additionally speeds up corrosion on all your metal suspension parts. Food for thought... a cap is good insurance against this and other problems.
If I were to buy another trailer, it would be a 8x10 size or so, V-front, drive on & off, with a cap of some kind. This is obviously for 2 sleds. I've given thought to a slightly longer trailer so I can just toss my otter
Lodge ice house right on the back of it.
You asked about wheel bearings... let me tell you about how well I maintain my stuff. Bought the trailer new in 2002, I've never greased my bearings. I'm more than likely going to do it this fall however for peace of mind.
I'm really interested in Oil Lube Hubs but a couple wise men said why fix what ain't broken. Grease packed bearings have been doing the job for many, many years.