How to build a trailer for utility or camper base

I built a utility trailer 5x10 based on the 3500 lbs axle. The process is pretty straightforward if you have plans. I draw all my plans in Fusion 360. If you need plans, send me the request, it's free. First, I cut the tubes(1x2) to size using the band saw. Next, weld it together to make a frame. The more advanced part is the tongue. I use 2x3 tubes for it and 3x3 for the coupler bar where the coupler is bolted. This part is extended to match the clearance of my truck. The horizontal lines of the truck and the trailer should be the same for better and safer towing. The tongue tubes is starting from the point where the front eye of the leaf spring is connected to the frame. The other most important part is the position of the axle on the frame. I used some calculations to predict the weight distribution. Of course, it's just a raw guess based on my understanding of this issue. If you decide to repeat the steps you need to make sure you understand what you will put on your trailer. For a camper and a utility box it will be different, the position of the axle may vary.
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Website www.overlandn.com
Camper details:
based on the short bed Toyota Tacoma TRD Offroad
floor: plywood painted with polyurethane varnish and Flex Seal for the bottom
walls: composite material beBond
insulation: XPS Foamular 1 inch
interior: FRP white panels
integrated frame: aluminum tubing
SeaFlo water pump
13-gallon water tank
Renogy solar panels, controller and DCDC
1kW inverter
Propex heater
Camera equipment:
GoPro 8
Truck modification:
2017 Toyota Tacoma TRD Off-road MGM
CBI T3 front bumper
Smittybuilt winch X2O
Fox shocks
Deaver leaf springs
ARB Safari snorkel

[@stanta11]

Maybe a stupid question, but why not use plastic fenders ? No rust, easy to fit and replace and cheap! I’m in Europe, and when I see all of these American style trailers I always wonder why they always choose to make there steel fenders ?

[@realsystemrobot]

I use it as a step when loading. It's also very durable in the forest on a tight trail. I don't want to replace parts, I prefer to build it once.

[@jerrykilby9330]

Need to put center of ur axle 1’ past dead center of frame it will give u better give u better tongue weight and ur side pieces for ur frame same thickness as ur tongue frame and not have to add metal for axle mounts