Send him registered letter return receipt that you are going to charge him for storage at some value per month or have the vehicles removed and send him the bill. Problem you will have is if they are in his name so you can't sell them.
After three years, it would probably be reasonable to do so, but you should give him official notice of your intent before you do it. Send him a certified letter giving notice that you will be disposing of it in 30 days if he does not make an arrangement to come and get it.
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