Inability to register trailer, semitrailer, mobile home or recreational vehicle before April 1

vehicle before April 1. If an owner because of sickness or absence from the state is unable to renew the registration of his trailer, semitrailer, mobile home or recreational vehicle on or before April 1, he will be deemed to have complied with the law, if before operating the trailer, semitrailer, mobile home or recreational vehicle in this state he registers it at some later date and pays the fee for the full year, just as though he had renewed the registration on or before April 1. The owner shall file with the application an affidavit showing sickness or absence.