Vibration @ 50 mph

[Fred n' Ethel]

Hi folks, here is an easy one for ya ... I hope.
54 PU, right around 50 there is a vibration of the frequency of the wheel rpm.
Couldn't tell if it was front or back as there was no transfer to the steering wheel.
First, I found a broken shock on the rear. Put 2 new ones on and balanced the rear wheels. One was out quite a bit as I had the spin them up before removing the original weights. Test drive .... still the same "shaking" vibration at around 50.
Decided to check and balance the front wheels. They were very close but one was a little "eggy" and didn't spin absolutely true but was balanced. At this time I also noticed some play in one of the kingpins. Test drive and same problem. Put 2 new shocks on the front .... same shaking but no noticeable transfer to the steering wheel.
I'm not sure if the eggy tire is matched to the loose kingpin or not. Could one or the other, or both be making me shake ?
Also, the front motor mount is turning to jelly. Could that contribute ?
So, 4 new shocks, 4 balanced, 1 eggy tire and 1 loose kingpin.
The spare is an old original bias-ply, guess I could try that in place of the egg
for a test, but the others are radials. Safe to do ?
Thanks.
Thanks