in michigan a home made trailer needs to be weighed after construction but it does not need to be inspected. once you have the weight you have to go to the secretary of state and apply for a homemade trailer title, then you have to buy a permanent plate (cost $65 if i remember right) but then youre good to go until they come up with another way to make money on the liscensing process. its kind of nice because i have a homemade boat trailer that i made from a pop up camper and i have a homemade dirt bike trailer that i made out of a boat trailer (ironic i know) and they both weigh roughly the same so i just bought 1 plate and switch them back and forth. theres no need to worry about tags because the plates are permanent, but they cost $65 vs like $12 for a new tag.