Arctic fox truck camper 990 or 992?

No comment on 990 vs 992. That's just personal preference imo.
You ar picking a very capable sweet combination though!
Regarding 4 season camping, there's a difference between "normal" winter and the northern reaches of the continent. Just because Arctic is in the name does not mean it's Arctic rated! I'd expect to do some mods/ better insulating/and prep for "true" 4 season up north. They are more of a 2.8 season camper up there without some help. Been As cold as low teens/single digit nights and above freezing and sunny during the day and a AF 860 with no additional help/insulation peeled through over a 30lb bottle of propane and would run the batteries dead on the furnace fan before you were ready to get up in the morning.
Any colder or more use at those temps would have warranted shoring up some things on the camper.

On the truck, again talking out my _____but I would prefer simplicity in extreme low temps. At 30-50 below lots of things break that shouldn't.

Thank you all this is super helpful!!! We are currently looking at a couple of Dodge Ram trucks 3500 dually with or without air ride aka air stabilization system. Anyone have experience w air ride versus after market air bags re: stability, diving performance and maintenance, particularly in northern climates and also towing?

Also, all those who responded have 99s, any 992s out here????

So great to hear about winter performance. This would be so awesome as we live near some gorgeous mountain passes!!!!

Thanks again!

Wife and I love our 2014 990 we have a 2015 ford PSD CC LB with upper and lower stable loads. Handles great always loaded to the max water propane fuel, ect. As we live in northern Mn we use in winter just like summer. we take it snowmobiling full of water and everything. on the road with generator, clothes food ect we weight #14340 Front #5640 Rear #8700

Here is a review on Truck camper mag that may help you out.

http://www.truckcampermagazine.com/camper-reviews/2017-arctic-fox-992-review/

You are looking at pretty much what we have. Our 990 is a 2016. We can slip in and out w/o having to move the slide out. We enjoy the room a slide provides. As far as our truck, I have upper and lower stable loads. Ended up with installing air bags. Made a big difference. Feel free to reach out with any questions.

I like a passenger side dinette/window myself. Often we stop alongside the road for lunch or to take a break from driving usually the view is on the passenger side.

We have the 1150 which is a very similar to the 990 camper, just a bit longer. I have found that to comfortably get to the bathroom the slide needs to be opened a bit. Not much though and it's easy to do before climbing in. Same at the grocery store or to get in for any reason really. You can squeeze in but why struggle?

We are mostly full timing now in it and coincidentally we are currently in Alaska, 2 adults and 2 60 pound dogs. It does get cramped at times. As far as 4 season camping, I have no desire to be where temps are extreme, either hot or cold, so we have never really tested the 4 season capabilities but the furnaces in these things put out a tremendous amount of heat although they gobble up propane and battery to do so.The camper stays pretty warm with reflectix wrapped windows and 4 warm bodies inside. But if needed we will crack a vent and use a potable indoor approved propane heater. (that's a whole other topic/debate)

Lastly your considering a late model Dodge Laramie dually. We love ours. Our last truck was a 2004 Ram diesel dually which we liked but I am still amazed at how much more truck the newer truck is. Power delivery and confidence while loaded with the camper is night and day. That's comparing a modded (air bags, shocks, sway bar..older truck to a bone stock newer truck. Aside from fuel economy numbers (11-12 vs 13-14 with TC) zero regrets. That 2015 Ram Cummins will put a smile on your face when you hit the hills.

We have an 03 990, wife, myself and 3 kids. The additional bunk over the table makes it work. When everyone is up and bouncing around it is crowded, but everyone has room to sleep at night. It works for us.

There are two of us, the wife liked the openness of the 990. You have to open the slide to use the bathroom of the 992, but the dry bath might work better for your children.

Well, I have a 990 and it's large enough for "Just me" solo, so I would think, between the two, the bigger 992 would be better.

If I remember correctly, the 992 is what? 2' longer or something like that? Sorry, don't remember. They, dealer - excellent by the way, advised that for solo the 990 is and will work fine, and it is.

With 3 others, it might get a little crowded so bigger might be better..

I'd feel almost "Crowded" with an additional person, it would be tight but manageable.

It's really just getting used to it, good luck.

Hope that helps a little.. but in your scenario, I would think bigger is better...

Happy trails, sounds like an adventure of a life time..