the 350 and 450 are drw. 16" tires on the 150, and 19.5's onthe 450, 16: tires on the srw 250.
Yep.. mostly always warm.. and mostly flat. we do have SOME topography.. but not straight up and down like some states.
We do get wet, vry very wet and windy.
here are my experiences on those vehicles int he following conditions I have used them in:
Rain / water.. without a doubt.. more ruber onthe ground makes me feel better. I have hydroplaned slightly in srw vehicles and , at least for me, experience it less with drw vehicles.
Plain out heavy load / long / big trailer.. Again.. I'll take DRW any day. feels safer, feels like more control. Stopping... I can stop both my drw trucks faster than my srw at speed with load. the 450 actually does the best ironically
traction: I can usually go in 2wd on the drw vehicles where i have to use 4wd in a srw. in fact.. my 450 is ONLY 2wd.. the 350 and 250 are 4wd. In soft sand more rubber floats better.. less fishtailing.
snow / ice: Not much exp there. i have driven in N. georgia / tennessee and texas during snow and on black ice a FEW rare times.. and honestly.. I tried to drive so ultra safe it was hard to tell much of a difference except on initial acceleration and fast braking. again. more rubber helped not break traction.. again.. i have only a few trips experience driving on icy roads. most of mine ae either hot and dry.. or warm and wet and windy.
turning radius. : got me... the bigger vehicles take more space.
Parking: Got me... slightly more choosey on parking the drw models.. mostly because i don't want smashed fender wells due to other peoples's bad parking habits.
Tires... cheap tires seem to wear out faster and have more road noise.. though past that.. havn't noticed too many other negatives.. not that those aren't enough. Multi purpose tires like traction grip off roads make plenty of noise and 'feel' different n the road.. more positive or tight.. and maybee even rougher ride at low speeds.
that's significant because at least one of them is a dually, maybe two right? no diff in srw vs drw? You are in a warm area that's flat. Wonder if that is a true test, though I know your experience is huge. Boy I've driven some seriously winding mountain roads in the rain and fog and I sure did not want to worry about hydroplaning or skidding with the motorhome. Never had the slightest problem, obviously drw. Goodyear Unisteel G670 RV 245/70/19.5, four channels, five ribs, not much siping, but got the job done.
in my experience, high quality tires can make a big difference in performance, have to be sure one doesn't have tires issues vs. truck issues. I usually stick with Michelin for the truck but interestingly the fifth wheel I'm interested in offers a 17.5 HD trailer tire option, the 15 to 18 ply jobs. Probably worth the money. Don't find those at Tire Rack. Apparently used for lowboy trailers and other heavy hauling.