So how do you guys keep your tranny fluid down in the pan during a roll over?
I rolled over this summer and it was a pain because once i got it right side up i still had about an hour worth of clean up with all the spilt tranny fluid. It came out of the fill tube.

you need to determine where the fluid came out; dipstick tube or vent.
"rollover" vents that seal are available, and "o-ring" seals are
made for dipstick.

wrap the vent line around the tranny and back to the top.

I have learned the hard way as well... What I did was, get a roll over ball valve from Fuel Safe, then remove the dip stick, slide a piece of 3/8ths id rubber tube over the dip stick tube, then install the roll over valve into the rubber tube... All fixed...
Check your trans fluid level when at home in your shop by simply pulling the rubber hose off and inserting the dip stick, then leave the dip stick at home, and never worry about spilling a drop...:)