I have an 840 on my 2006 F350 SRW. It does really well with just the stableloads (upper and lower). With just the uppers engaged it still does okay but highway speeds with full water tank feels much more predictable with the lower ones engaged. The truck squats very little with them. There is not a lot of rocking when going over gutters and bumps. I don't see the need for spending the money on the fastguns. Perhaps if I had them I would feel different, but I needed the money somewhere else.
I find the truck tows a trailer well with the 840, but I have a long bed. I use an 18 inch extension for my 8X5 utility trailer and carry a Polaris 870 Sportsman in it -- no problems there either. Limit how much stuff you carry and try to fill with water close to the camping destination and you will see it is a really good match for this size truck. Not sure how the short bed difference will affect you. My rig is actually more stable towing the trailer, but my weight is much less than you are contemplating.
I think the 840 is an outstanding camper with great ergonomics for a non-slide unit. I love the views out of the rear of the camper with windows on three sides. You will want a Fox Landing as soon as you step on one. They are the bomb! The landing is high enough to be pretty much out of the way for most hitch set-ups. The overhang that will result with a short bed may negate this option.
Let me know how the 11K A/C unit runs on a 2000i Honda. I only use mine on shore power. We camp above 6000 ft in the warm weather so no need for it unless using it at home or on road trips at campgrounds.
The only problems we have had with ours are:
1) The medicine cabinet shelf is pathetically weak and breaks no matter what I do to it.
2) The upper front wall of the cabover seems to be delaminating slightly just below the roof curve. There is no sign of moisture penetration. I have noticed this on other Wolf Creeks as well.
3) Some of the interior wall paper is slowly losing its grip along some ceiling edges. Not really a big deal but irritating.
Everything else on this camper has been reliable and bulletproof. So far so good. Not interested in switching to a larger truck or camper until I retire, and maybe not even then. We love this thing. Here's some things about it that I have found to be true:
1) It needs two batteries. Two group 27's will fit easily.
2) Even in winter using heat the two propane bottles last easily over a week. On weekend jaunts I find it hard to tell if I have used any gas at all.
3) The tube on the side for the septic hose is perfect and allows one to carry long items like hiking sticks or fishing poles in the bumper.
4) The lounge bed will sleep short people easily but tall folks will have to do the fetal position. The cushions get tiresome by morning.
5) Having space on either side of the bed to perch on is great for making up the bed, rather than having useless cabinets there.
6) Don't leave the cabover escape window open if unattended. If a strong wind comes it can blow it wide open and the control lever can get pulled out which may puncture your screen.
8) Blocking the bath skylight with Reflectix keeps the room much cooler/warmer.
