As the owner of a 2007 co alaskan I can say I agree with most of the prior comments that have been made.I will try to address some pros and cons.First I must say I owned a 9.5 foot hardside for about 5 years back in 1990-to1995 and hauled it on a f-250. The alaskan we own now is on a DRW 3500 dodge, a much more capable truck.But the alaskan and truck combo drives and handles so much better because of the lower profile we would never consider another hardside again.The inconveniences associated with the popup are absolutly worth it.
Lower profile fuel mileage probally would not increase much as the alaskan is somewhat heaver than most other popups, maybe almost as heavy as a similar size hardside.To answer the OP's other questions.Cold weather camping has been limited to about 15 degrees,the furnace was more than adequate.The top to bottom seals work great and are still in good shape after 7 years.The cab over panel seals however could use some improvement, when windy outside we do experince some drafts.On one particually cold and windy night we used some rolled towels in a couple spots.Raising and lowering is a bit fussy untill you practice a few times with the adjustments,then you can do it in a couple of minutes without problems.Not a lot of inside storage we cured that with a flat bed and tool boxes under the wings.No grey water storage was cured with a custom built 25 gallon tank placed between the outside tool box and the camper.Blowing wind and rain could be a problem,however we have raised and lowered in a steady rain with very little issue.The cab over factory mattress is only about 4 in.thick and not quite enough.If you change to a thicker one the c/o panels will not fold down properly.What we done was just carry some extra memory foam pads and add them after set up.IMO the craftsmanship of the alaskan is very good and I would definately would not hesitate to buy another one should the need arise.OP if you have any question PM me if you like. Hope this helps.
Ramp