Peter, Peter, Peter, why in gawd's good earth would you buy such when it's nothing to make?
I've been making gates, big gates that look like they're wood and they're not, well, they are wood but there's this steel frame backbone that gives them the whatevers to stand up to anything.
You can buy sixteen and fourteen gauge two inch square tubing that's galvanized, aluminized, etc from your local fence wholesaler.
You can cut it with anything from a hacksaw to a chopsaw. Then you can take some eighth inch by two inch bar stock and cut it into three inch pieces. Drill two holes caddywampus from each other, and weld that tab where you want to pick up the wood.
Look <A target="_blank" HREF=http://photos.yahoo.com/bc/wroughtnharv/vwp?.dir=/Wood+fences+and+gates&.src=ph&.dnm=inside+view+gates+opening.jpg&.view=t&.done=http%3a//photos.yahoo.com/bc/wroughtnharv/lst%3f%26.dir=/Wood%2bfences%2band%2bgates%26.src=ph%26.view=t>at this</A>. This is a pair of powered gates. They're eight feet tall and the two of them work in harmony to close a twenty eight foot opening. They look exactly the same from either side. Each one weighs easily over a thousand pounds. In two and a half years I've had one maintenance call. It was operator error. Homeowner has umpteen patents in electronics but zilch in mechanicals.
But that gate and many others like it around here made by me use tubing and wood together. Where I'm different, besides the obvious, good looks and all, is I use the principle of having the two bys sitting inside the steel frame. That way when it comes time to covering the whole thing it's nail gun time one oh one happy days two oh two.
It would be nothing for you to build the frames on the floor of the garage. Then bolt them up on your slab. Lag in the wood to your tabs, and then nail gun or nail apron time!
Those big gates belong to a wonderful couple that's awful baptissy. As we were pushing the remote the first time watching them big puppys do their thing I asked if they were real familiar with their pastor. When they said they were I asked them to invite him over and we'd let him pretend he was Moses, parting the red cedars........../w3tcompact/icons/laugh.gif