Help with parking area

I dug out two "strips" and framed out of 2x4's so that the concrete would be even with the surrounding ground. The strips that I made were about 18" wide and about 4-5 feet longer than the wheelbase of the fw. My original fw was 23' I think, but also worked on my 31'. If yours is 40', I would think you would have to make the strips deeper. I also bought square stepping stones that are about 12" square (you would have to figure out the width to fill in the area between strips). As for the landing gear, make squares a little larger than you think would be necessary, in case you don't back up perfectly. I rented a mixer and bought the extra strength concrete, added the steel and wasn't hard at all (that was a long time ago though).