Or you could buy a real truck and have no worries. Mini-trucks are meant to haul mini-loads. Big boy trucks are meant to haul cars and the 4 wheeled trailers they sit on.

But I do like the project here. Should be interesting to see it progress as what you've done so far has been nothing but one improvement after another. My GF took one look at those wheels and went, "who does that to a nice set of wheels? I'm glad he took all of that blue shit off."