When we traded earlier this month, the inspection on the new unit expired earlier this year, but the trailer registration won't expire until May 2016. I asked if I needed to get the inspection up to date and they said "no, just get it inspected before you renew the registration next year." Apparently, they're using this year as a catch up year to get inspections and registrations in sync. This doesn't answer TravelTiger's situation, but I think you could've waited until the 90 day window this fall to get the inspection.
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