I've had an annoying constant clunk every time i come to a stop from reverse or forward. I've taken it to the deal many times. the truck has 3k miles on it 2015 single cab.
In my case, it was the fuel in the tank actually sloshing around. but sometimes the clunk is so hard i feel it into the cabin.
the fuel tank is un-baffled (cheaper production). so the fuel plays around and gives you a knock.
they have installed a 3m insulator around the tank. and the noise did reduced by 50% but still is there.
if its not your yoke or leafs, then it most probably is the fuel tank. ive made a post on it.