Your point of "it all has to do with weight" is incorrect. Regardles of weight, a tandem axle has to be ***led and licensed in Oregon.
Utility trailers in Idaho have no ***les, just registration slips and plates. Up until last year we could buy a 10 year plate but yearly now.
Seems easy to me keep it under 2000 lbs. From Florida DMV web site. A certificate of ***le is the proof of ownership to a motor vehicle, mobile home or vessel in Florida. Florida law requires most vehicles to be ***led and registered. The exceptions to ***ling are mopeds, motorized bicycles, and trailers weighing less than 2,000 pounds.
Obviously, you put it on a trailer! I know that States recognize other States registration but if the State you are from doesn't require registration and you take the trailer into a State that does require registration, could it be a problem? I guess I would prefer to have some proof of ownership from a government agency just in case. I like the idea of an inspection so I don't end up hitting something in the road because somebody's home built POS fell apart.
http://www.oregon.gov/ODOT/DMV/contact_us.sh Now im being a ****.... I called the eugene number because you caused just an ounce of doubt, but you were still wrong, it is a weight thing. This is getting a little off topic as we are in a different state as the OP. Im done. Have a nice day.