D- or E-rated tires on K20

[johny1i]

Hey guys,
My K20 is my daily commuter, and I seldomly pull a trailer--never anything more than you would pull with a C10 (4-wheelers, hopefully an 18' ski boat in the next year or two!). Question is--I've always been a believer in BFG A/Ts and the sizes I'm interested in are available as either D or E-rated. I have E-rated tires on it now, but I'm wondering if that is making the already rough ride of a 3/4-ton 4x4 unnecessarily worse. Cost isn't an issue--a 265/75-16 in those two ratings varies only by $4 each on Discount Tire.

Thoughts? I'm hoping a D-rated tire at 30-35psi will be an suitable substitute for a 45-50psi E-rated tire given what I use it for.

Thanks!!