Few questions

[Spray-Bomb]

Ok, I have a few questions here

#1 How much can I notch the frame & still be strong enough to haul something around 3-4 thousand pounds ??? (I plan to plate the top / sides & box the inside, & use a piece of 4" 1/4" wall pipe) I just need to know how deep I can make it & still be safe

#2 At what point is it advantageous to flip over the trailing arm mounts ??? (I have a one piece drive shaft, so I don't have a carrier bearing to flip)

#3 What is the optimum angle for my shocks to run at (I am building new shock mounts)

#4 Last but not least, if you were building a long panhard bar to run from the frame to the passenger side trailing arm would you use rubber bushing syle ends or heim joints ???

Thanks, Matt

P.S. I do not want a step notch, just something I can build that is hopefully deeper than a bolt in notch