Here's my trailer I built last december. I used it to haul 3 loads up to 250# or more, up to around 45-50mph, along with several lighter loads at those speeds. Man do I wish I had trailer brakes.

Tires are 26x1.95"... The bed is 48"x19", overall width is 32" to fit in the back gate. The main frame rails are 1.5" square tubing, side and cross rails 1.25" square tubing, and the tongue is mostly 1" tubing. The hitch end of the tongue is 1.25" square tubing with spacers welded on the inside to have a near zero play connection to the hitch pin.

The corners of the trailer have short sections of corners of 4x4 box tubing, that I used to screw the pegboard and wood to. Overall this is a very solid trailer.

Here it is all painted for the rain season, cuz it lives outside. Rubber undercoat, bedliner bed and some frame, etc.

IMG_2897 by Tony K

IMG_2871 by Tony K

IMG_2856 by Tony K

I like a pin with a spring loaded ball on the bottom end. Hooking up takes about 10 seconds, put pin in and connect 12V hot wire.

IMG_2857

That frame is long gone, long story but I had braced the rear end with C-channel and box tubing, and doubled up the left side gusset for the trailer hitch. It was replaced with a frame stretched in a similar way but no trailer hitch, so I haven't used the trailer since winter. My new frame however, is going to have a quarter inch thick left side gusset and has .100" wall 7/8" tubing in the rear end, so we won't be seeing any issues!

Flux core welds

I lost the trailer once on a left turn when it was fully loaded, and the tongue snapped in the middle. it started rolling into the oncoming lane where there was a car coming... almost hit a corolla.... I fixed it out on the road with a "splint" of wrenches and gorilla tape that took me 30 minutes to make, and 30 minutes to remove

I want to take this bike on a lengthy road trip however, I probably won't be taking this trailer. It is just too heavy and massive. I'm trying to decide between a monowheel trailer or a leaning sidecar... one more wheel only.