I bought a 1965 Alaskan that had been a hunter's cabin on a Missouri farm for many a year. It was my first attempt at restoring a camper. In this case it was a 8', non-cabover. I quickly learned the first rule of TC dos and don't when buying an old camper - check out the damage from the leaks.
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Well, it was serious. There was water damage everywhere. But, as I dug through the camper I was more and more impressed with the quality and beauty of the workmanship. The hydraulics still worked, lifting the top up and dropping it down. The wood was gorgeous, drawers were perfectly made, doors swung well, etc.
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Eventually, I decided that it was better on the farm than restored. so, back it went. But, I was very taken with the Alaskan and have come to think it is probably the best constructed camper on the market. I met a fellow at the Mid Atlantic Truck Camper rally who has a brand new Alaskan and he was really tickled with it. So, I think you should be assured of the quality of the construction. I never experienced the issues of weather and bugs while lifting the top since mine was not a cabover, so I don't have any advice on that. Hope this helps.