BFG does make an E rated tire for our trucks. It is the BFGoodrich® Rugged Trail T/A LT265/70R17. I have not heard very many good reports on these tires. Here is a link to the spec sheet.
http://www.bfgoodrichtires.com/assets/pdf/rugged_trail_ta.pdf
I have been shopping tires for 2 weeks. I am completely frustrated with the general lack of knowledge in the retail tire industry. Half the guys don't know what products the tire company they represent makes (Firestone/Bridgestone store), the other half were shocked when I asked for an E rated tire, "Dude, what do you need an E rated tire for?"
I think I'm going to have to take out a second mortgage to get a new set of tires. Why is the 17" version of a tire $75 more than the 16" version of the same tire? It can't be that much more costly to make.
Wow, I started just to tell you about the rugged trail and turned this into a rant!

Sorry!
John