You are off a lil GD3.
homebuilt trailers under 1000lbs you just fill out a form, show recipt for materials and a weight slip. Hand it to the DMV, pay your dues and they hand you a registration, plates, and the VIN tag you weld to the frame somewhere.
over 1000lbs, its a trip to the dmv, get temp tags, and set up an inspection appt (week to month out). drive it to the inspection guy, hope he doesnt fail you, then go back to the dmv with the pass paperwork and get your tags and vin.
its a pain in the ass, and why most either do what i am doing, or do it through Maine with a “power of attorney” form and middle man/company to get plates and reg.
as for the quads, thats a whole new ball game I am not familiar with.
Gotchya didn’t know it was a homemade trailer. Still its the difference between a title and a transferable reg. And everyone knows a transferable makes life a ton easier.