I dont know what tires you guys are taking about. I dont see them, only thing is Super Swamper Trxus MT radials which only go up to 35".
As far as 38"s go for 16s, there is TSL 38x13, Thornbird 38x14.5, Bogger 38.5x11, 38x15.5 SSR, 38x15.5 PJ dirt grip, 38x15.5 Iroks.
If I was to pick one of them it would be the SSR, PJ dirtgrip very close 2nd.
I dont know if you can trust the Iroks yet, they are faily new, and all i have heard is they are soft for rocks.
My next set of tires is going to be 36x14.5 TSL radials. My 35" MTRs already bit the dust, Im riding on basically slicks till I get the money for new ones.