Weigh the back, weigh the front.... Check your tire max weight capacity... Dually rears subtract <>200lbs per tire... Bet you are under the true handling weight of your truck...
Check the Gross rear end axle weight and the front suspension.
We have discussed this topic way past a blue in the face thing....
My Bfoot camper only adds 300lbs to the front of the truck full loaded 50 gallons of water and and and.