Best way to build a deck next to your RV

Well, I built ours rectangular, 7' by 20' with somewhat narrower steps and a roof about 1 inch above the trailer roof ht. Now, what I did different is I put flip up crank wheels (like on a small or boat trailer) on each leg of the porch so that if I wanted to move it I would just rotate them down and crank the deck up so the wheels were lower than the legs and then just pull the deck out away from the trailer and push it back in when done, lower the legs back down and flip the jacks back up out of the way. I used eight of them, as I said, one on each leg of the porch. With the ability to move the porch back to the trailer, if I'm not exact on trailer placement when I come back to my spot, it's no big deal. I got them at one of the cheapy tool places like Harbor Freight. By the way....I used the set up a couple of times and it worked great. When we moved from San Antonio and I sold the porch to somebody else in the park, they moved the porch with the wheels, until they hit the speed bumps on the roads, then they didn't work so great but for movement to and from the trailer they worked.