You need to mail him the title after you receive payment, than he can go to his own DMV and register it/insure in. I don't see a reason for him to get temp plates, thats just more work. Your DMV won't give a damn, just make sure to turn the plates in so you don't keep paying taxes on it.

I just sold my SDL to Joe in FL, thats how its done.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200