dadwolf2 wrote:
Driving on the beach or in deep sand is the only area where I believe there is a legitimate complaint with 19.5's. Yes, you can't air down 19.5's. Pizza cutters? The 245/70-19.5's are about the same width as my stock 265/70-17's. Offroading in terrain that requires "offroad" tires? How many truck campers that are this heavy are really going to the extreme 4x4 conditions that a slightly softer tread compound is going to save their bacon?? Any forest service road or gravel road will certainly be fine with the 19.5.
Finally, I want the safety margin. I could be careful with my camper load and be at 99% capacity of the load E rated tire without a lot of effort. This is also a lot cheaper than getting rid of my low mileage 5.9 Cummins and get a a new dually.
From my nearly 8 years of driving with them I can tell you that they 1) Have a more rough (stiff) ride... especially when unloaded. 2) More tire spin on wet surface.... especially (or only) when unloaded. 3) Poor traction in the snow. 4) Super crappy in sand. Now, that is what I personally experienced in 8 years of tire use. Maybe folks have different results.
The primary advantage is strength, durability, and SAFETY with a load which is huge with a 3500+ pound camper.