tell you the truth man, I did the trap door technique once and it was about just as easy to drop the rear and benchpress the tank down.
I thought the trap door was easier at the time but after i got to know the car a little better I realaized it didnt take that long to yank out the rear and drop the tank.
Not to mention all the flaming that happened at TGO on the TBI board which is one of the reasons I stop posting in that place.