That is the first I have ever seen a yak style on the back of a dirt bike, would have not even thought that the yak nuts would fit. Pretty cool. I own a BOB my self and have put about 25,000 kilometers on mine, used on trail, all around expedition, used on my fat bike, road bikes, and one of my velomobiles. My son and daughter get to their MDing sites using a velomobile with a Fake Yak like yours.
When my kids got their fake yaks, only forty bucks each new I had to get me one to test. I found that the fake one is much better, just tracks so much better on trail in mud, dry ruts, blow sand, loose gravel. But also the fake is rated at 40 kilograms, totally BS, it can safely carry about 65 on that stock cheap tire and rim.
If you check out Racktime, they make a rack for a kids bike that hold like 25 kilograms that is a direct mount giving you pannier access but also giving you a nice flat surface on top of your trailer from the end of your tire to the front of your basket. Its about 130cm, perfect stability to mount a small sluice, tent, sleeping mat.
Now with that rack on, just flip it over and you have a table.
Want more stability and extra security to haul more weight, big fat wheel barrel tire and rims is a direct bolt on.
One of the best bike trailers I have ever owned is my fake yak. My BOB is retired for good since I got that one. Another good trailer worth its salt is from Surly, Trailer Bill. Not sure it would fit on a dirt bike, but the mounting process is about the same and you got yak nut on a dirt bike. LOL