Looks like you are being ambitious and resourceful. Good work.
When you are ready, a light tow-behind and your pick-up truck (?) will be a step up.
If you try to dump to the side of the trailer, you will be loading all of the weight on one side and will be torqueing the trailer. Probably not built for that.
Looks like you will get a lot of tongue weight for your truck, as the load is not balance mostly over the axle. Just be sure you can handle the tongue weight. If you are seriously overloading the tongue weight, besides overloading your rear axle, you will be lifting your front, reducing your steerability. Be safe. What are you pulling with?
I started with a 5.5 hp Craftsman and an Astro van. Then a 70's 9" capacity chuck and duck chipper ($2400) that I bought from a guy that upgraded, which I still have, and its still Hungry. Then a 1990 Ex-Asplundh rig with an 11ft dump bed and man/ equipment cab. Working for me. Everybody starts somewhere.