Movable Wooden Wheeled Sign

Once you get your framework, wood panels and trailer all put together, do you really think someone is gonna be able to pull it with that little handle ?? Also, what's gonna keep if it from blowing over ??

 

Those are really small signs. Do they really need to haul them around or are they wanting to have something they can put out when they want to and move it out of the way when they don't? Seems like a A-frame might work better for that rather than a complex heavy custom built wagon.

 

It would probably be better and faster to make it out of steel. Rectangle bottom, square tube uprights on each end sort of like your picture capped with angle to mount the top of the sign and another angle (angle edge up to match top) across each bottom side to attach the bottom of the sign. Id also make a provision to attach this contraption to some auger style ground anchors so it doesn't hurt someone in a bad wind.
The angle on the top in the center may make it lay back to much, that you would have to toy with.

 

Easy to make, I could make you one, but freight shipping would probably be around $600

 

Bolt your support system to one of these or some other pre-made wagon as they are cheap, have wheels that will work and if made of metal, will be heavy enough not to tip over.

 

why not just use a nice red wagon as you base construct a frame for you panels. use a couple of screw-in anchors (as in a dogs run ) to tie it off.