I'm on 275/65/18 XL Ridge Grapplers and love them. (This size also requires a lift.)
Shopped around, and it was about the lightest tire I could find in the approximate similar sizes. I started on the OEM 18's, and it felt a bit sloppy when responding to steering input.
I found a deal on some 18x9, which straightened out the sidewalls and it's a lot better.
Yeah, they're not a comfortable offroad as 17s would have been but I'm not doing anything hardcore. Air them down to 15-18 and it really helps offroad.