I love car ports.
Depending on storage/cargo space depends on what type of legs you want. I prefer the ones from costco with the single piece legs, just cause its one less piece to have to put together. But you also need a 6 foot long storage area. Not really a problem with any sort of truck or van, but could be a pain if your just bringing a car. I have a Shelter Logic that has two piece legs. It packs down smaller and I can fit the whole thing into two 36" long duffel bags I got at the Army Surplus. Only reason I got the shelter logic is that I picked up off craig's list a couple months ago for $75 bucks.
I also found, last year, that darker colored ones(like CostCo used to sell, maybe they're still the same) stay cooler during the day cause less light comes through the top. My Shelter Logic is bright white, and I don't know how much UV it will block. So, I'm going to stick with the original roof, but I'm adding some of the good UV blocking tarp under the roof, but above the roof joist and ridge poles.
For stakes, get some rebar 18" long, I went with 3/8 (can be found at the local big box hardware). Put about 6" in a vice bend it to about 90 degrees, then as you start to bend it more, beat the hell out of it (near the vice), so that it makes a nice check mark shape and not a candy cane. If it is a check mark shape its easier to beat it into the dirt, cause you can hit it flat on with a hammer. Also consider taking an extra piece of rebar and bending it in the middle to make a real lazy V shape. It can be hooked under the rebar, grabbed on both sides and a good strong standing up motion will pull the stakes out at the end of the week (remember to keep your back straight as you stand up).
I'm with CapSmashy on the ratchet straps (I might also be with him on the orange steaks, I haven't seen these yet, but they're probably worth checking out). If you look around for ratchet straps, you can find bright yellow or orange ones, that have a reflective thread woven through each edge of the strap. I feel that this is reflective enough, that I don't light my straps. Make sure they have metal ratchets, plastic ratchets work fine for stuff just being held down to a pallet for shipping inside a trailer, but they wont stand up to the sun and heat. Get the straps as tight as possible then ratchet them tell their super tight. Then in wind storms watch corners of your carport magically hoover an inch off the ground but not go anywhere.
Why don't ya stick your head in that hole and find out? ~piehole
Plan for the worst, expect the best. Make the most out of it under any conditions. If you cannot do that you will never enjoy yourself. ~CrispyDave