30 ft rca run too long for a phono to preamp?

What table are we talking about and where do you have it currently with respect to your system pictures? Are you thinking of moving that stuffed chair and placing the table there, next to the truss?

Mike what about moving the chair to the right away from the A-frame beam and mounting the support, sandbox and TT on the beam.

Hi Dan, it is a thoren td-147, I currently have it where the c-30 is in the picture as I have upgraded my preamp, but not my systems photos. I am thinking about moving that chair to the right.
Sam, I thought about it, and it would probably be the easiest, but there are 2 ceiling fans across that beam, when I put my hand on the beam I can feel their vibrations, I don't think that would be good, but the vibrations are at a much higher frequency.
I understand there is going to be some trial and error, I am trying to minimize the number of holes I drill into the wood wall. You should see my floor.

Sorry to highjack my own thread, but this is turning into a turntable isolation thread.
Tvad, I am having a hard time finding info on ceiling hanging, is this better then a wall shelf, would I use heavy chain, and a slab of granite? poured concrete? I have moved the speaker and added 2 more isolation platforms and now I can stomp my foot close to the turntable without skipping, most of the time. I recently blew my 10" acoustic coupler voice coils on my Vandersteen 3a's, so the deep bass is not there right now, but I think it goes to about 35hz, and I am not getting any terribly noticeable feedback, but I think I could do better. I used the hi-fi new lp and my cartridge resonates at around 12 hz, so even with the couplers back in after repair, the speakers shouldn't cause an issue at 20or 25 hz. It would be nice to be able to completely isolate from the floor, and the wall is not bearing, and is underneath a 10ft window. It shakes when I bang on it.

Resonant frequency of the arm/cart has nothing to do with acoustic feedback, so don't let that fool you. Anything from about 200Hz down can cause issues.

You definitely have your hands full with springy floors and a somewhat tight space. I'm not sure how the Vandy's will react, but pulling them out from the back wall another foot might help with the pressure that is building up along that wall. And, if possible, it might be better to pull the table out from the wall as well.

Can you brace the floor from underneath?