I did not think the 11 vs 9' AF model is much of a consideration weight wise. From what I've read, the weights are similar ish.
Maybe someone can post the cg dimensions of both models from the front of the camper. I dont think they change much and probably won't matter from a handling standpoint. My concern would be over hang both length and departure angle with the longer camper if you are doing much off highway driving.
Aside from owning a shortbed truck, lol, one of my big concerns and a selling feature of the AF 811-860 was no vertical drop behind the truck bed. Almost impossible to drag tail unless I'm doing more than me or the truck should be tackling with a camper on board. Also allowed for more simple trailer hookup options with more vertical clearance than a camper with a drop down overhang.
Just a consideration.
Going boondockin I'd take a 990 over a 1140. Still got the dry bath, just a smaller dinette. Little trailer for all the other "junk."
