Business Travel - Tax Deduction

[Spencer Stevens]

Hi BP, I am curious to know what proof do I need to travel to Utah (from Oregon) to check up on a rental property for the IRS audit of my business trips? I could possibly save down pictures of my texts with the tenants, notifying them I am coming... However, I do want to do drive-by's without them knowing I am in town? Does having a rental property in Utah qualify for a business purpose without needing any evidence?