Alannyiri wrote:
I've "solved" this dilemma by going for a Knapheide Westerner body instead. The bed height increase is lower - 5.5" rather than 7.75" for the TM - and the toolboxes are all just 12" above the bed. There is not a taller box in front, so that concern is eliminated. Not the maximum amount of additional storage (about 40 cubic ft),but the maximum amount of confidence. Thanks again to you who responded!
Good decision, it weighs about 1100 lbs plus weight of the bumper.  Probably about 800 lbs more than the stock bed/bumper.