Any tire bigger than 33" is too much for a D44, unless you are crusing down a paved road straight.
That's a pretty blanket statement... there are plenty of guys on here running 35's on 1/2 tons w/o many major issues...
Plus it depends on where you wheel... I only hit the sand and currently run 38.5/16-15's on a 14ff/10b combo and haven't broken anything because sand is forgiving...

