By Friday the camper was ready to be put on my truck. I estimate that it weighs ~400lbs in its current form, so I recruited several friends (6 of us in total) to lift it into position. All in all, it went fairly well. Any fewer people and it would've been pretty heavy for each of us, any more people and they would've been in the way. Each side of the camper is bolted directly to the truck's bed rails with 4 3/8" grade 8 bolts. I also added a gasket from Extruded Solutions, Inc. around the perimeter before lifting it up there.
Today was its maiden road voyage. Its not overnight ready yet, but we took it out to Mt Bachelor for a day of skiing. About 6 hours of driving throughout the day and it felt solid. I checked the bolts after the first drive and everything stayed tight, so that's great. On the way to the mountain (a net uphill drive) I averaged about 12.5 mpg, with generally conservative driving at about 55-65 mph. Without the camper I would average about 15mpg under similar conditions, so I'm fairly pleased with the gas mileage (though current gas prices still make driving any sort of truck kinda painful, i'm glad its not my daily driver). I notice a lot of wind noise though, which is to be expected. I have short term plans to add a wind fairing to a roof rack on the truck, and long term goals to lay up a fiberglass nose cone of sorts that can be attached to the truck. Total frontal area on the cabover section is 15.5" by 69". In hindsight part of me says I should have made the cabover thinner with more fabric pop up, but I think the difference in fuel mileage from a couple inches of frontal area would be negligible.
By this evening, northern Oregon was getting hit with a storm, so we spent about 2 hours driving through heavy rain. I checked the camper for leaks when we got home and found that the doors are the primary source of water intrusion. This isn't surprising, as they aren't really done yet and there isn't a seal between them and the tailgate. The corners of the bed next to cab also leaked, but I'm not sure if that's due to the camper or just the design of the bed. So I'll be investigating that a bit as I drive it more. The only concerning leak was in the cabover section. It looks like after all that driving my drip edge curled upward slightly, which exposed the gap between the roof and camper to the incoming water at 60mph, and at that point its somewhat inevitable that water will find a way in. So my options right now are to either stiffen the drip edge, or get 6" width vinyl curtain material so it has more coverage. I'm a little surprised it curled up though, as I thought the wind resistance would keep it pinned flat against the camper. Anyway, more investigating to do on that part.
So other than fixing all the issues I have with the doors and chasing leaks, its now on to interior, insulation, and electrical.