Front End Dolly Idea

I was thinking of building (having a friend build actually) a front end dolly similar to some of the others I've seen on FABO. Harbor Freight has these "swing back trailer jacks" that are rated to between 1000-1500 pounds and I thought they would be great for providing a vertically adjustable dolly. I did a crude little drawing to try and illustrate the idea. The trailer jacks are $27/each.

Thoughts?

Thanks!