Changing the cars oil every 5000 miles means it gets changed about every 3 months.
Right now changing the trucks oil every 5000 miles means it gets changed about every 5 months. The truck gets driven every week.
My truck with the camper loaded weighs 10850 pounds. I've only had the camper off the truck once in over a year and it was only for two days when I took a car trailer to SLC to get a car for a friend.
The truck gets worked pretty hard every time it gets driven. No way am I going to scrimp on oil changes. Besides, I do them myself so its not a huge expense.
And I rotate the tires every oil change too.