Looks real neat, but you shouldn't call it a utility trailer.  You should call it a RC hauler...

I did a similar thing for a guy I work with for his motorcycle, popup trailer frame, with a plywood deck and without the dovetail.  He carried his cycle one time and it's been sitting in his yard for a year or so...

I expect to see this at Disney.

My trailer is quite similar but bought "commercially, off the shelf"

My own ponderings on my trailer. Dove tail is cool (only 2ft but works) but I wish it was maybe hinged or floating. Certain steep driveways will scrap the whole way. Never seen a "floating" dovetail before, I just imagine one not rigidly fixed, and could move upward in certain circumstances but NOT downward, as in some limiting stop.

I also have to check into laws, but would like to move my tail lights up higher. Even cars often cannot see them, because they creep up so close to you at stop lights. Furthermore, seems everybody I know has had a right/rear blow out and some point in time, myself included. Tire tends to destroy the light in the process.

I will also buy a new 3500# stub spindle from northern. Welded to some 2x2x__ square tube. Then buy a spare brake drum. Load it with packed bearings, seal it up, and viola! A spare tire carrier ready to go with a preassembled hub/drum.  I don't have brakes on front axle (probably illegal?) but IIRC the drum will still fit up front even though it would seve no purpose other than holding the wheel.

Ya I forgot to mention the removable pole part. That way I can pull the poles off and drive over fenders. Keeps them up away from the road spray/gravel/puddles, and where those stupid tail gaters can actually see them. Still got to find the legalities of the issue. Those small town cops could find 100 reasons to pull a person over. Don't want to find out tail light height is one of them.

Here is something I did to mine... i had boards over the tires for my truck to drive over... but they seem to rot so quickly.. i put rebar strips over the tires so the trucks might grip better than slick wood..  maybe it is a weight savings too.... But one of these days I am going to deck the whole thing....