I’ve had to deal with many old, shitty, trailers in my life. It is what it is. That said, they’re simple enough that “rebuilding” one is a lot easier than real mechanical work. Here’s what I’ve done so far.
Ball Hitch
The boat trailer has a 1 7/8″ hitch. I think such things are an abomination. I planned on swapping the hitch mechanism on the trailer to 2″.
Everything ought to have a 2″ ball except for the big stuff that’s 2 5/16″. Here’s the deal, if it’s huge and needs a 2 5/16″ ball you damn well know it. If it’s small and wants a 1 7/8″ you don’t have that on your vehicle because nobody does.
However, the part on the trailer was in reasonably good shape. Removing and replacing that part would probably cost $30 and kill a few hours. Besides, I have a cheat code. So I left the trailer as it was.
I highly recommend my cheat code. It’s called “Convert a ball“. With it you can switch between any of the three sizes instantly and without tools. It’s worth every penny. I have the slightly more expensive version that has a little box to hold your balls [insert joke here]. The box is a big deal. If they’re not in a carrying box you’ll lose your unused balls [ugh.. the jokes are too obvious]. I’m going to stop right now; just know the expensive 3 size system with the carrying box is money well spent.

Why do I have a second (spare?) 1 7/8″ ball? I have no idea. Why is the 2″ ball so grody? Because I use it 1000% more than the others.
Everyone should be awesome and roll around in a truck that be setup to tow anything of any size. Unless you’ve got a smaller SUV, then don’t mess around with 2 5/16″ anything. Seriously, you may think your SUV is bad ass but don’t argue with physics.
I assumed the 2″ ball was seized up and sprayed liquid wrench on everything. I probably didn’t need it. With a few taps of the hammer, the locking shaft mechanism worked pretty well. Wow! I wire brushed all the crud off just because I ought to.

Then it was effortless to install the 1 7/8″ ball. I added a generous glob of grease to stave off rust.
Not a big victory but a necessary step in the process.

Trailer Jack
The one on the trailer is absolutely shot. It’s gotta’ go.
I rooted around in my shop and found a new in the box trailer jack. I think I bought it 10 years ago to be installed in this very spot. That I kept it for 10 years and found it when I wanted it is a miracle.

No photos because it ain’t done yet. I’m pretty sure I won’t screw it up.
Tires
The tires held air, which is impressive after all these years. But they’re tiny 4.80-8 pipsqueaks. I could just buy the tires myself and mount on the rough but airtight wheels. But the bearings need repack. I can do repacking but I hate doing it, I always get grease everywhere and I’m never sure I did it correctly. Sometimes it’s best to just pay a dude.

I went to a super-redneck tire place. They’ve always been great and I’m glad I know them. One guy was more than willing to put tubes inside of my crappy old tires and send me on my way. I love that! They know it’s a boat trailer and some boats never go more than 5 miles from home to dock.
Not for me though. I wanted good safe new rubber. There’s weather checking on the tires that doesn’t show up in the photo. I know they’re at least 10 years old and they were probably old before I got them. Plus little 8″ tires spin fast, too fast for my tastes. So to spare me drama and worry, I asked for new tires and no tube.
So that’s what’s happening. If I were a true mechanical stud I’d mount the tires myself, repack right there in my driveway, and just testosterone the whole situation into submission. I didn’t. I’m waiting for the tires to get done. Two cheap ass tires won’t break the bank and $25 for packing is a fair deal.
I don’t have a spare. I tried to explain that to the tire guy and regret it. I over-nerded the poor innocent dude and now he’s got details floating through his brain. I’m not sure what he’ll do. I should have kept my mouth shut. I never quite learn.
I’ll update when the trailer’s back.
nice writeup about a productive day!
I prolly gots 15 hitch tubes with a variety of Ball sizes. Most are drop or riser tubes. I’ve got zero 1 7/8 trailers left, but i’m not dumping the tubes with that size ball. Sure as God made little green apples some neighbor is gonna need their trailed hauled and I’m fairly well equipped for that.
Our family has gone towards the 3 ball hitches and they work for 90% of our vehicles and trailer.