Found me a project trailer...

[MikeSchinlaub]

I also measured the axle. I don't know where it's supposed to be measured from, so I went with the back of the hub. I got 86 1/2

 

[dingbat]

I also measured the axle. I don't know where it's supposed to be measured from, so I went with the back of the hub. I got 86 1/2
View attachment 406079

View attachment 406080

Tire are mounted to the face of the hub.....
Hubs vary in thickness

Hub face and Spring centers

 

[MikeSchinlaub]

I don't know how close the measurement needs to be, but I would eyeball the hubs at 1/4" thick, so that would make 87 inches.

 

[ratdude747]

I don't know how close the measurement needs to be, but I would eyeball the hubs at 1/4" thick, so that would make 87 inches.

Close enough to the 88 I measured... so 87 or 88 probably OK. Assuming they are in fact the same trailer (and one/both aren't slightly tweaked variants made for a custom order). 88 is a common straight axle size (as is 87), so either one is believable. Edit- the keel roller setup is different... so clearly not the exact same trailer. As long as the springs are centered, I'm confident in my 88" measurement (69 + 9.5 + 9.5)

Spring mounts match... so that's not the issue.

Looks like my springs are the issue... which makes sense, at low load leaf springs shouldn't be nearly flat. Yours have a lot more curve... and the empty trailer's weight shouldn't matter that much. Heck, I stood on it and the only thing that compressed were the tires (likely underinflated, but inflated enough for running light). Also, yours has 4 leafs while mine have 3. Not up to task?

Per my measurements, I have a spring spacing of 69", and the spring length is 26" (frame) / 25 7/16" (spring eye to eye, no shackle). I'm fairly certain they're standard 1 3/4" wide springs... but I didn't get a measurement (and I'm out of town).

While I might be able to save a few bucks by having a shop add flanges to the axle, I'm thinking it might make more sense to just replace the axle and springs as a set. Around $600-$800 before freight from what I'm seeing. Not currently in budget, but this trailer is a long-term project, so that's fine if it's justifiable.

 

[MikeSchinlaub]

I have a picture of me holding a tape measure against the hub and I did an eyeball guess from memory of the hub thickness. Shows how smart I am. Anyway, all this stuff about suspension components is above my head. I'll take measurements of other stuff if you want, but I'm out of advice to give.

 

[ratdude747]

I have a picture of me holding a tape measure against the hub and I did an eyeball guess from memory of the hub thickness. Shows how smart I am. Anyway, all this stuff about suspension components is above my head. I'll take measurements of other stuff if you want, but I'm out of advice to give.

You're good. Saw what I needed to see.