You may just need to put a little weight in the bed, 200 lbs of whatever (in bags of course) makes all the difference in the world

 

I have 20" Perellis. I would agree with dale29, 200lbs and I haven't had any problems. I looked to replace my tires with BFG all terrains, as I have owned 2 previous pairs.

However, after some high speed driving in the rain, with & without a load, I really like the Perellis in the rain.

 

I just replaced my 20'' Pirellis before the holidays, I was having issues with snow and ice. During my shopping I noticed there was 2 sets of Pirellis that looked identical but one was winter rated and the other wasnt. This might explain why some people are having better luck.

I replaced mine with 20'' Goodyear Wrangler Silent Armours and so far so good. These are the same tires we equipped all of our ambulances with as well and I havent heard any complaints from any of the Paramedics. My selling point was that I got them for half the price of the BF ATs (which were my first choice).

 

I just bought the Good Year GTII, so far so good I hope they last. I went with a big tire size 285/50/20.