These are torsion axles, I don't think you can make a leaf spring axle fit an rpod without major surgery. There are 5200 lb torsion axles available if you want to go that route, which would probably be the best solution in the long run. You would also need new brake assemblies, drums, wheels and tires for the 5200lb changeover, so that will get pretty spendy. 

Yes, the inboard axle mounting points on the rPods do substantially increase the axle tube loads, actually by close to a factor of 2. That being said, it is worthwhile finding our for sure what is causing your negative camber before deciding on the fix.  It could be the axle tube, but it could also be the spindle or the torsion arm. If its the tube your local shop might be able to straighten it but it will be weaker afterwards, if its one of the latter two problems your axle is probably toast. 

Once you find out what has failed on your axle please post that and some photos on the forum, it will help others here troubleshoot their axle problems in the future. 

If you determine its the axle tube and the shop is able to straighten it (it should probably end up with a little positive camber built in, I have about 3.8 inch in mine), you might want to look at the reinforcement mod i just did on my 179 last week. I posted a topic on it. I didn't want to extend the frame mounting points because that would put additional torsional load on the frame rails, which are pretty light (IIRC they're 0.1 inch wall thickness 2x4 tubes). My fix worked out well for the "diamond" axle tube I have, some rPods have round axle tubes which would be harder to add reinforcement to.

Alternatively, you could weld in a gusset plate between the torque tubes to help handle the torsional load on them from extending the mounting points. 

If you go with a new axle you can get the mounting flanges wherever you want them, but probably with a 5200 lb axle you could leave them where they are and be fine. 

Good luck, and welcome to the forum. 

Edit: 3/8 inch camber not 3.8 inches

I really like your custom trailer build. The air springs are a nice feature, you could even level it side to side with those, some rpod owners have noted their trailers sitting quite a bit lower on the slide side. I'm just not sure you can get a leaf spring axle to provide a ride height as low as it currently is with the torsion axle, but maybe you want it taller anyway.  

I understand your concern about a 5200 lb axle being too stiff.  It will depend on how heavy your loaded trailer is. In my case I'm very near 3500 lb on the axle when I crank in the wdh loads so I wouldn't be too concerned. 

I can't count the times I drove from the mountains into the tule fog when I lived in B'field.  It looks just like that as you come off the Grapevine. But the fog over the Central Valley looks pretty much like the fog over the ocean too, except that it tends to get denser with more limited visibility, but that's not so apparent from the top.

I've noticed that the tule fog doesn't seem to be as prevalent or persistent now as it was in the 50's through the 70's.  I can say I made decent money defending fog crashes when I lived in Fresno.  There were always people who insisted on driving like it wasn't there and that always turns out poorly for everyone else.

Too much and the wrong kind of vegetation to be overlooking the central valley.

The html indicates this was taken during a trip to Big Sur. 

The tule fog is mostly a winter phenomenon and the marine layer mostly occurs in summer, and more camping is done in the summer....

Yes, the tule fog and the marine layer look similar from on top. Big difference is the marine layer almost always has both a floor and a ceiling. For the tules, the floor is pretty often 0 AGL. Not good. 

Maybe we should start a regular topic where folks put up a some photos of their pod somewhere and we have to try to figure it where it is. Like GeoGuessr for rpods. No fair cheating like I did by inspecting the HTML.

Now that would take up some excess time over the winter till we can go camping again. 

offgrid you misquoted me.  You left out "But it could easily be on the coast too."  

When you say turnbuckles, which are designed to be used in tension, are you talking about putting tension on the end of the axle to pull it up? If so, that will be counterproductive, the axle problems occur when the wheels take a bump load and are pushed up, so you need to support them by pressing vertically down on the axle ends. 

If you haven't already, take a look at the thread "axle reinforcement" for my solution to this problem.

If you want something adjustable you'll need a jackscrew of some type, which has much heavier parts in it and fittings that are designed to keep everything aligned to prevent buckling. If you don't need it to be adjustable maybe just get a bracket welded up with a box tube extending down from the axle mounting bracket to the axle. Then through bolt the tube to the clamp set up you're planning at the axle end. 

Good luck!