I've ran many rigs with BFG All Terrains on them and have always been happy with them. The ride has improved, less harsh. Overall height is just under 1" taller and 30 revs per mile less. Even though they are load range D they have 3306 lb rating single, my old 235/85/16 LR-E were 3042. Handling seems fine empty, haven't pulled anything yet.
The spacers came from Performance Wheel & Tire in Sheridan, CO; 303-934-2929, they are on the web also. Spacers are available in many widths. The 285's would just touch when the truck was let down off the jack, so I went with a 1" aluminum spacer (minimum width available). You put the inner wheel on, then the spacer (you have to cut the studs down so they don't protrude through the spacer) and torque the nuts, then bolt the outer wheel onto the studs on the spacer and torque. Very simple. The only bummer is there is no flange to center the outer wheel, I just centered on the studs the best I could. I'll try take a pic with the outer off and post it in the next day or two.
Later,
Wayne