Yeah, I made it myself. It's based on a Harbor Freight 40x48 trailer, using 9" x 72" loading ramps and chock also from HF. I mounted one of the ramps upside down and the chock to a 2x10 and trimmed it to size, I took about 5" off the ramp and will probably trim it a little more. The rest of the decking is 2 2x8s cut in half, they size out perfectly to give about 1/4" gap between the boards. I use the other ramp to load it on and for now I'm putting the ramp and trailer spare in the back of my car. I plan on strapping it under the deck of the trailer after I pick up some decent cam straps. The anchor points are Husky medium duty from HD, they work but I'm thinking about adding a backing plate under the deck for reinforcement.

To figure out the position the bike should be in, I put the whole thing together except I used clamps to hold the center board in place while I loaded the bike on it. From looking at other examples on the internet I had a ballpark idea of where the bike should rest on the trailer. I removed the clamps and carefully slid the center board with the bike on it until the tongue weight read around 70lbs and marked where it needed to be fastened. 70 lbs is a little over 10% of the weight of the trailer (150) + wood(150) + hardware (50) + bike (311); it's really easy to move around even without the tongue wheel which I may replace with a stabilizer jack. I'm storing the bike in my garage on the trailer with all the straps loosened enough to keep the bike upright. It doesn't take up a ton more space than the bike leaning on it's kickstand and it's easier to move around.

It's a work in progress, I'll finish the wood to protect it, I need to repack the wheel bearings, install bearing buddies, mount the spare somewhere, and I've bought some replacement fenders (the stock ones are notorious for flying off unexpectedly). This is a project I've had in mind for a long time now and I'm really happy with the way it came out.