as well as since there a vine you can also grow them cage style as odd as it ma sound they take up less room and you can possition your pumpkins so the grown down out of the cage not only will they form pretty well perfectly since they arn't touching anything they're lots of air circulation to stop soft spots , the downfall when they get big you may need to put some support underneath (stockings or panty hose sligs) so the stem doeosn't break....
I really need to put a garden in my new house i havn;t grown any in years....to make the cage you simply take some garden wire...siimalar to chicken wire and form a lage cylandier, lay it on it side in the garden i make mine about a yard in diametre, as your pumpkin tendrils/vines grow train them up the sides of the cylander as the bloom try to get the fruit to start growing on the inside...as you don;t want all your blossom to form fruit it take too much out of the plank when you have about 3 pumpkins or 4 going nicley on a plant, pluck the other suckers and flower to make sure all the plants energy is going into the few fruit on the vine....
hope this helps
oh here is another good article i dug up
http://www.columbiamissourian.com/stori ... -all-fall/