It's the spacing of your axles. My semi bounces like that if I'm hooked to a closed tandem trailer going up thru there. With a 48' flatbed with an 11' spread it's fine.
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Rest in Peace Dex aka BFD99 6/2/12
97 #12vqclbmafia slipping auto
00 Pete 378 12.7 Detroit 10spd
03 Pete 379 6NZ Caterpillar 18spd
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