Not at all. When I weigh my Cobra to set corner and cross weights, I use 4 bathroom scales and 4 fulcrums. Not as easy as fancy racing scales, but they sure are a whole lot cheaper.
I was thinking it was a small lightweight trailer, since a truck scale couldn't do it. But 1,500# is a lot of weight (for an empty trailer).
If you just want to know how much the trailer weighs, I would weigh truck and trailer together, then remove the trailer and weigh the truck alone.
If you want to know how the trailer is balanced, where the center is, etc, you'll need individual scales.