I will make a call tomorrow to the local hobby stores around here and get the contact info for a killer tail stand many of us use here in the Okla City area. It has a 3/8" spike at least 12" long that is pushed into the ground. The padded horizontal stakes are curved to keep the tail down until your ready to taxi. To release your plane simply pull the plane backward a few inches until the stakes clear the tail. They automatically fall down and you can taxi right out of the stand.
Maybe someone will see this before I can make the call tomorrow and post a website or phone number. But I'd even be happy to make the buy and ship to those that need it. About $35.00 is the going price if I remember right. Had mine for over 3 years of heavy use.
As you can see in these photos they will accomodate planes from 25 size to giant scale. The largest I've witnessed was a 40% Sukhoi.
And if a big twin gasser can't budge it ,,, I'd call it it foolproof.