I've ran mud grapplers in 38x15.5. They balance well, wear well, and if you lower the pressure down from the max, they ride good. They did great in the mud, sand, daily driving, and snow, but sucked in ice. Can't blame that on the tire, it has more to do with having an unloaded bed.
The biggest complaint is the noise. 38x15.50's are the loudest of all the mud grappler sizes. Not sure why, but they're considerably louder than my 40's. If the noise doesn't bother you, then it's not an issue. The noise doesn't bother me(I only put an avg of 75 miles a week on my truck) and they're some of the best looking tires out there. It sounds like you don't put many miles on your truck either, so they're an option for you.
Oh and nitto mud grapplers are garbage. I would put Boggers on my stuff before I would ever run that tire. IMO
To the OP, beware of comments like these. Unless they have a reason for why they're garbage AND have actually ran them on their truck, most of these are BS. Mud Grapplers are actually a tire with great reviews and I've never heard anyone opting to run Boggers over them on a road driven rig.
On another note, I've actually seen more negative reviews for Toyo Mt then Mud Grapplers. The Toyo's are amazing road tires but don't clear out well at all and have a reputation for getting stuck
E99 F250 CCSB ZF6
DynoProven tunes, FF 180/100's, 6637, 4" exhaust, CTS
4" PMF shackle lift, V codes, Bilstein 5100's, PMF Dual Steering Stabilizer w/ Bilsteins, 35" Terra Grapplers, 18x10 mo962
Harley headlights, billet grille, nerf steps, 08 mirrors
01 Ex 7.3l Limited
Swamps tunes, 6637, 4" exhaust, 6.0 trans cooler, Hellwig rear swaybar, CTS