J1955

Hi, I'm looking at several options for a vehicle that can pull a travel trailer primarily. My question revolves around how old is too old to safely pull a trailer? How would I know? Some SUV's for example have tow hitches installed already. Others obviously don't. I'm concerned about rust for example, and how would you know if it's safe? Is it a 5 year old vehicle? 10? Vehicles to stay away from? Thanks! John