My clubs go on the floor behind the driver's seat with the back seat folded up in my f150. When there are 3 or 4 people in the truck my bed has a bed mat and a soft tonneau cover that works well.
In the Carolinas our temps have been mid 90's with high humidity. Heat index is around 105. 3 holes in I'm soaked head to toe and stay that way the rest of the round. Can't wait for cooler temps.