Having just replaced the axle on my '84 Scamp
13 last August, I went with the 'weld-on/bolt-on' philosophy
. My original torsion arm axle had gone from either 10* or 22.5* down angle leading arm, to more'n 10* up. Had NO flex at all other than tire sidewalls
. Since I wanted to add brakes
(& didn't want to go to the trouble of changing to a trailing arm arrangement I just ordered the Dexter #9, 2K#, in 22.5* down, leading arm axle w/7" electric brakes
. I measured my existing axle very carefully & ordered the 'weld-on' side mount brackets so the new hubs/tires/wheels would fit in the same place. Wasn't real sure of the thickness or strength of the Scamp
chassis but the existing axle bracket was a 1/4 thick piece of steel angle, already welded to the chassis so I did my computations so I could merely cut off the vertical side of the angle & weld the new side mount brackets to it.
When the new axle arrived my grandson & I set the trailer on jack stands in his shop, torched off the old axle/brackets at the pre-determined line, and dressed the torch cut with a grinder. With the side mount brackets (think they were about $16 ea??) already bolted to the new axle we lifted it into place with a floor jack, squared the axle/spindles up to the frame & coupler center, clamped it in place & spot welded the new brackets to the part of the old ones still welded in place. We then unbolted the new axle from the brackets, welded them completely to the old bracket (along with a couple of small reinforcing filets at front of new bracket & chassis joint), re-bolted the new axle in place, mounted the new wheels/tires (I went from 4 on 4" wheels to 5 on 4.5" with the new hubs), hooked up to my TV & brought it home.
Even tho the trailer had towed well with the original axle, the difference was like night & day with the new one. Using part of the existing mounting bracket made it lots easier to align & install the new axle, & it'll be easy to replace 20yrs down the road
Old axle showing where we 'torched' off the bracket, & pic of new installation