SN65HVD233-EP: CAN BUS PROBLEMS

CANBUS PROBLEMS:

LOOKING AT TRAPPING ERRORS THAT OCCUR ON THE CAN LINE:

I HAVE SEEN A PAPER ON USE OF COMMON MODE CHOKES TO REMOVE SPIKES FROM THE CAN LINES, WHERE DO THESE SPIKES COME FROM?

EACH CAN DEVICE HAS ITS OWN TERMINATION RESISTOR, AS MORE NODES ARE ADDED THE VOLTAGE LEVELS FALL, GIVEN WE ARE STARTING FROM 3.3v SHOULD WE BE THINKING ABOUT INCREASING TERMINATION RESISTANCE?  

SHOULD EACH CAN NODE HAD A SERIES RESISTANCE ELEMENT, WOULD THIS HELP?