The custom plate costed 160. And 160 per year to insure. Homebuilt trailers are getting very strict here with sgi. Luckily for this trailer it was manufactured with a vin (magnum trailers). Although my homebuilt for my ice shack required and officer to basically give it a "safety" before being able to insure it.
Things are quite different here. I have a few trailers ...
2019 Clipper Teardrop - I had to provide proof of insurance to the dealership before I could pick it up. Annual cost is $215. No annual plate cost. Insurance basically covers damage and theft at a stated value. Liability is covered by insurance for the tow vehicle(s).
1986 Cadet Fibreglass - Cannot get insurance. Company for the above insurance wouldn't even talk to me. They also have my house and car policies! $25 one time fee for licence. Liability is covered by insurance for the tow vehicle(s) and there is no extra cost.
Home built expedition and utility trailers - basically the same as above.
There are NO government inspections for home built trailers of this size. I've registered 3 home built trailers, 2 before they were finished and one before I even started to build it. I like to think I do a good job (see my sig below) but anyone can screw up. Many I've seen shouldn't be on the road. I've seen some making drop offs at the town dump that should stay there!