Pup tent trailer

Hey all, I'm new here. Name's Greg and I'm from the province of Newfoundland, Canada.
I've been thinking of building an ultralight trailer for a while. I figure, if they can build 'em light enough for a motorcycle to haul, I should be able to make one light enough for my tiny little car to haul. Trouble is, my little car is too small to haul much. I figure 400lbs is the max for an Aveo with one or two passengers.
Getting on to the point:
Cutting down on weight is the key to my little idea here. so I've come up with a sort of a ridged pup tent. Yeah I know, not so much room in a triangle but I'm working on improving it a little bit... Perhaps widening it at the top with an extra piece. (barn style roof?)
Excuse the terrible artwork but I was hoping you'd all be able to see what I was getting at, and maybe offer some pointers.

I've been thinking of building an ultralight trailer for a while. I figure, if they can build 'em light enough for a motorcycle to haul, I should be able to make one light enough for my tiny little car to haul. Trouble is, my little car is too small to haul much. I figure 400lbs is the max for an Aveo with one or two passengers.
Getting on to the point:
Cutting down on weight is the key to my little idea here. so I've come up with a sort of a ridged pup tent. Yeah I know, not so much room in a triangle but I'm working on improving it a little bit... Perhaps widening it at the top with an extra piece. (barn style roof?)
Excuse the terrible artwork but I was hoping you'd all be able to see what I was getting at, and maybe offer some pointers.
