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Before you tear it apart, the 6.0 has a VGT (variable geometry turbo) and when it builds excess boost, since it doens't have a blow off valve to release it, it does exactly what you're hearing, it releases it through the intake which is why you hear it on the drivers side.
It "could" be an EPB/EGR problem depending on the conditions. Towing, on a grade like you describe, is the most common place for you to hear it and may be perfectly normal. If you notice when it happens, your RPM's are probably low. The motor can't use the boost it's calling for. If you downshift and get the RPM's up (kick it down or sometimes just use T/H for the grade to get the RPM's up) it won't generally won't over boost.
You can also "make it" do that by hammering the throttle and letting off real fast. You're telling it to create a lot of boost so the VGT responds, then you leave the motor not able to use that boost so it burps.