Wow - I'm missing something or the extendable OEM mirrors on my past '06 F350 CCSB or current '11 F250 CCLB wont go out far enough to see the rear tires on our 5er. Yeah, I can kinda see part of front ones but for sure, I'm a lot more interested in the traffic around me and what the wingnut in the econobox with a phart can muffler is doing or that person tending to their makeup or cell phone while entering the interstate on the ramp and not accelerating.
As far as an ST tire having stiffer sidewall - don't ever believe that myth. A 37 pound Tow Max, and a tire that so many manufacturers are using as original equipment cannot compare in strength to a 45-50+ pound LT, be it a highway rib or a 'standard' LT, or a G614 (which IS a 57# LT tire). As a matter of fact, just this morning I compared sidewall flexibility between an ST and a new LT, same size - there wasn't any comparison.
Now, are all the ST tires bad? No, but there are enough cases that sure make me wary with the weight and size of many of today's towable RVs that I've put LTs on our ~13K, 38' 5er
