I tried LT265/75-16 E with a 8" wide tread on a '90 2500 chevy with 6.5" OEM wheels pulling heavy GN trailers. The truck was a handful to keep on the road. So dumped them for the good old LT235/85-16 in the same tire type.
One thing I've found running heavy loaded wheels in my hau;ling business is the tire works best when the wheels width closely matches the tires tread width.
Also tread type such as a rough AT with large lugs and voids isn't as stable under load at highway speeds as a ribbed highway tire.
Lot on the net about tire wheel proper fit for the job. This from;
Dunlap
RIM WIDTH
*Correct rim width ensures flex at the designed flex point in a tire sidewall for optimum tire performance.
If the rim is too narrow, the flex point moves toward the shoulder area, creating heat buildup in the shoulder, which reduces tire life and could result in failure.
If the rim is too wide, the flex point moves towards the rim area, causing heat buildup in the lower sidewall, which reduces tire life and could result in failure.
Within the acceptable range of rim widths, one can select wider or narrower rims than the measuring rim. Selection of a wider rim, from within the approved range, (T & RA tables) stiffens the sidewall and improves handling at the expense of handling. If carried too extreme, either too narrow or too wide of a rim, it can result in uneven tread/pavement contact pressure causing uneven wear and potentially reduced traction, or increased vulnerability to bead dis-lodgement.*
