It isn't wise to just bolt it to the floor, because the bolt pattern is so small and it'll tend to work loose. Park makes a fairly inexpensive (I might even have one) 1' square plate to enlarge the bolt pattern for those who want to bolt it to the floor.
Other options are a cardboard drum with concrete poured in to a depth of 4-5". Or you can also make a trip to the scrapyard and look for something like a floor fan base, or whatever can support the stand by virtue of it's weight or size. If they're ripping up a street nearby, see if you can promote the used manhole cover.
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