If your new Crewmax or Dcab SB Tundra has similar bed bounce or knock-the-cell-phone-out-of-your-hand behavior as srapf experienced, and you can't get rid of it (curious, even with added weight), you might want to give a pair of Sulastic spring shackles a try. They were to have been unveiled at SEMA in Las Vegas this past week but I don't know if they did it or not but I just emailed them for an update and will report back.
https://www.sulastic.com/default.aspx
Ultimately you might want to trade your shorter-bed Tundra in on a Long Bed Tundra DCab. It's a whole different ball game with the frame stretch and commensurate wheel base increase (i.e. = natural frequencies are shifted out of normal operating range). No harmonics hit the long bed. I've got 19,000 miles on mine without a hop.