Camping Trailer Project: Advice before cutting metal

I don't believe that's going to be possible.

The axle bearing surface is what determines the load capacity, and the lugs used are determined by the axle capacity. the current axle is rated to 3500 pounds, so you'll likely only ever find 5-lug hubs, unless you know a competent and cheap machinist.

Far better to just run the hub adapters. Because the next option is changing the axle to a 7,000 pound to get to 6-lug spacing.

But costs are about 2-3x's as much. I had priced it out for my trailer... A fully kitted 3500 pound axle, new, can be pieced together for about $500-700 depending on parts sourcing(northern tool was selling my drop axles for $250 each, and I sourced the pair of brake/hub for $180) A full kit for a 7000 pound axle is about $1200(Johnson surplus), and heavily dependent on delivery/shipping options. With my location, I had the option to drive out to Johnson's to pick it up if i had to, which avoids freight charges, but gas isn't cheap either.

 

Got handles on the doors and custom (custom sounds way cooler than DIY) rod-locks on the inside.

Here is a look from the inside, with the roof of the box off. :


Basically the two "swivels" drive the rods up into the roof and down into the floor. They T-handles I used on the outside are "handed" but the swivel locks are not, hence the funny angles.

I used some screen-door turnbuckle reinforcing rod:
https://www.homedepot.com/p/Wright-...le-for-Screen-Door-Zinc-Plated-V691/202065835
and some swivel locks:
https://shop.hillmangroup.com/ccrz__ProductDetails?sku=853164&cclcl=en_US
and regular truck cap T handles (left right pairs).

Here's a look from the top/outside:

 

Next up was the roof, with lots of construction gun-glue:



Unfortunately I wound up with a lap such that the sides were exposed. The trailer was a touch over 48" wide on the inside, so I needed put put the floor/roof "between" the side walls.
I plan to add edging to cover it up, but it isn't ideal either structurally or for waterproofing :shrug:

(Yep, that's a diesel heater in the background. Another sort-of-DIY project, attempting to make it quieter and a little more compact.)