I have one similar to the one in your middle link. It' 6 feet wide and 10 feet long. I use it for everything. I did put 1/2 inch plywood sides on it. I use clamps so they can be removed easily. I've carried about everything imaginable with mine, but mostly my 700 series John Deere tractor with snow blower and LOTS of fire wood.
Towing with a 3500 duly, it's like its not even there, so another 500 pounds would make no difference with my truck. I feel no difference with the tractor loaded or empty trailer.
Looked at your 3 options, the first (link) has the lowest payload, second is in the middle, and 3rd has the highest payload. Middle link is the lowest price (and that price is about right. I paid about $1200 for mine a couple years ago in Central Indiana.
Functionally, for what you are wanting to transport, the 3rd is really the best for you, and here's why I think so: The 3rd trailer does not have side rails. Man handling your motorcycle and CAM, you'll appreciate NOT having sides to work around. Unless you plan to haul dirt or gravel, the sides really add very little value (especially #2). That's why I put plywood sides in, I haul all that firewood, and don't want it rolling off.
But #3 is a better fit for you (in my opinion). After you load your "toys", you'll no doubt loading additional equipment. 1975 pounds (middle trailer) will fill up VERY fast. A payload of 2230 pounds gives you MUCH more latitude .... but you have to weigh the issue for the price. BUT once you purchase it, I don't think you'll ever regret it.
I don't know about the trailering laws in California, but in Indiana, brakes are not required on a trailer less than 3000 pounds. My trailer does not weigh near 3000 pounds. But if I put something on my trailer and THEN the total weight of trailer and contents was more than 3000 pounds, and I don't have brakes, I'm actually breaking the law. That 3000 pounds is not just the weight of the trailer, it's the weight of the trailer and everything on it. I don't have scales, but I try to do my best to not over load the trailer. So even when hauling firewood, I don't stack the trailer to the brim! I KNOW the overall weight would be over 3000 pounds, and my trailer does not have brakes.
So, REALLY, this is something you REALLY need to ask and find out about too. What are the "brake" laws in your state? If anything like Indiana, and you plan to carry more than (.... say that 3000 pound limit), you really need to think about brakes.
Here again, I don't know he laws in California. If brakes are required on all trailers, regardless of size, then the trailer will come manufactured with brakes. But you really need to ask this question and get an answer before you purchase.
Good luck...
My vote: #3 for your needs.
My vote: #2 for my needs.