[Evans, Marv]

Denis. If you are intending to build two, car port like structures - one for your camping trailer and another for two or three cars, both are going to be pretty good sized and not super cheap if done right. You're a smart guy, so I'm sure you will figure things out as you go along. If it were me, I'd do a few things on both. First because of size, weather, and wind conditions, anchoring will be super important. I would dig round holes - couple of feet at least, put the hard, round card board tubes in them as forms and pour concrete with Simpson column anchors embedded for the vertical posts. I would use 4x6 (maybe pressure treated) on the corners and 4x4 for the ones in between. 4x6 for all would be better. I'd use 4x4 for the overheads w/ 4x4, 45 degree bracing on the upper parts of the vertical columns anchored to the overheads w/ lag bolts and steel braces where they butt together. You can buy ready made trusses for not too much. I bought 9 - 16 ft. w/ about 2 1/2 ft. rise from Dixieline 5 years ago for $450 for a storage shed. I'd go with 5/16 roofing sheets & rolled or tab roofing. An Important thing to defeat the wind is to cover the fronts & backs of the end trusses w/ plywood. This adds strength and keeps the wind from getting under the roof panels & lifting them. Unless you want to pour concrete slabs, I'd consider nothing or 3/4 in. aggregate, although that will fill up with blown dirt over time. Hope this isn't too long, but I'm sure you get the picture.