Weiserb, those two folks bring up VERY valid points.
I would first work on getting the table isolated better. This can be done with sorbothane footers, sandboxes, innertubes, vibrapods, constrained layer damping, etc... The approach that you take is up to you and your budget. Combining several of the above might be necessary depending on your individual installation and situation. Keep in mind that you'll have to find a way to keep the table leveled regardless of the type of isolation that you opt for.
I just got off the phone with Kevin ( KAB ) and talked to him about the rumble filter that they sell. It is a brand new version of an older design that he's very pleased with. As it mentions on the website, this device does roll off extreme bass ( -3 dB @ 20 Hz ) and does have a relatively sharp slope ( 18 dB's per octave ). It also sums low frequencies below 140 Hz or so to a mono signal. As such, i would consider this a last resort since the effects would be audible. Having mentioned this to Kevin, he was quite confident that most people that are suffering from rumble and record warp problems would find it FAR more beneficial than a drawback. Personally, i would think that most of your situation can probably be dealt with in more effective and less deleterious ways. Sean