I will try to dig up some pics, but here is what has worked for me, caribou hunting, about 30 miles rt and a few thousand feet of climbing, on pretty good mining roads with a fair number of stream crossings:
Burley flatbed trailer
Ditched the tiny wheels
Put on the larger wheels from my Burley kid trailer
Set them up tubeless
Put on 2.8” mtb tires
Ran them at looooow pressure
A friend of mine has a single wheel trailer and toured a couple thousand miles with it— Alaska, Canada, South America, —so they seem really bomber. However, I liked having two wheels with plus sized tires for stability and especially for float over sand and gravel during stream crossings. The larger wheels boosted the ground (water) clearance, as did the big tires. The Burley flatbed trailer is very light compared to the alternatives. Happy to talk more about bike hunting; it’s been working for me but I am still learning.
I am towing the trailer behind a bike with 3” tires on 29” wheels and single digit air pressures, so I have quite a bit of traction on gravelly climbs. Definitely I could not take a 2 wheel trailer on ATV trails; there the BOB would rule due to its ability to squeeze between ruts.