It’s one off an old Job box I had. I forget the brand, it’s rated for 1045 lbs, stamped on the side of the caster.
homemade, made it 5-6 years ago now. Never had any issues. Thing was all 1/4 inch steel and all the welds held. My guess is that the shift of the weight to the one corner when that caster popped off just folded it up.
funny thing, I was just considering buying a rotisserie last night and talked myself out of it. Don’t need it really now that the floor pans are all in. Probably just bolt up all the suspension stuff and set her down on all 4s