Have lots of memories much like Camper G describes. In my case it started with my dad renting a Tartan tent trailer and pulling it with his new 1966 Buick Special wagon (yep, clamp-on bumper hitch). That Tartan had nothing except maybe a sink. Cooking was done outside on a Coleman "green box" stove; light was provided by the gas lanterns that put Coleman on the map. No refrigerator - just an ice chest.
Oh, and that Buick wagon? Black vinyl seats and NO air conditioning. And our first trip was through the deep South in summertime.......