That's a nice little trailer...but the extra weight of the frame and the truck axle (without brakes!!!) adds a lot of unnecessary weight to the unit. An angle frame with a brake axle is by far the better (and safer) way to go...The way that's set up, you're pulling the weight of almost a half a truck behind you; never mind the load in both the trailer and truck!
Granted, you're saving money with the truck frame, but that's being penny saved/pound foolish, IMHO. As a former trailer dealer, I've got the experience in both directions.
My two cents...