Toyota imported many of the 4Runners without back seats, so that they would pay the lower tariff of a pickup truck on the 4Runner. You might be able to have the dealer run you VIN to see if you 4Runner was originally built without a back seat. Once the 4Runners were in the US, dealerships would install back seats so they could sell them. If this is the case with your 4Runner, then the back seat is dealer install equipment and can be removed to register it as a pickup truck.
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