What kind of heaters may we use in our tents when we go to our camp out being that it will be cold those days??

IDK. It's better to dress for the weather and have the proper sleeping equipment. A heater of any kind inside a tent is dangerous.

We use electric blankets and heated mattress pads on a queen size mattress frame.

If you have electricity I suggest a heater that automatically turns off if it tips over or lots of covers

Dress right is key, but Mr buddy heater must buy