As most modern big trucks are fiberglass, the bonding is moot.

"Richard Harrison" wrote in message
...
are under the hood, and their radiation should be kept under the hood by
the metal surrounding them. All such metal pieces should be bonded
together to keep the trap they form closed.

All conductors coming through or under the firewall should be well
grounded or bypassed with capacitors at the firewall. The exhausr pipe