Evidence from census, the obituary of John Gandsworth Wilkins, and newspaper records proves the Wilkins family traveled to Utah in 1851. They appear in the Iowa census in 1850 (taken in October). First documentation to place them in Utah is the rebaptism of John G. Wilkins in the Utah Stake City Ward on 1 January 1852. Further research is needed to determine the name of the company they traveled with.
His death certificate says that he had been in Utah for 79 years, which would make his arrival 1851.