M101A1 Trailer + Rivian tow rig

[often.05.barter]

Hi everyone,
I’ve been joking with my wife about starting a trailer park. I initially bought a Bantam T3c and used it for a few weeks, but then decided to look for an M101 since they’re larger and easier to use with my vehicle.
I found a nice M101 just 30 minutes away. The previous owner added a truck bed folding top, diamond plating, and painted it. I’m currently gathering parts to add a Dexter 3500 axle and 5x5.5 hubs so I can have a matching set of wheels for spares and take it camping. When it’s not on an adventure, I’ll use it as a truck bed.
Does anyone have recommendations for shocks to use with the 3500 axle?
Here are the specs for Rivian wheels:

• Weight: 88 lbs (with tires mounted)
• Size: 20x8.5
• Offset: +48mm
• Bolt pattern: 5 x 5.5
• Hub Bore: 64.1mm

I’m really grateful to have found this community with so much great information about these trailers.

IDK if this is allowed but I have three wheels, the original axle, and a hand brake assembly that I’ll be looking to sell soon. I’m located in Greenville, SC, and will be listing them on Facebook Marketplace.
Thanks!