Since you are new to Truck Campers, I suggest you spend some time browsing these two sites:
https://www.truckcampermagazine.com/newbie-articles/http://www.truckcamperadventure.com/Both of them have good info on matching a truck to a camper, what suspension mods, IF ANY, you need, reviews of the different aftermarket suspension accessories and tie down options . . .
Speaking of tie downs, if your truck has one of those PLASTIC factory bed liners, it has to come out. The truck camper will slide too easily on it in spite of how tight you make the tie downs. They make rubber bed mats that grip both the truck bed and the bottom of the camper, that help hold it in place.