Groaning sound when climbing steep trails?
I haven't let this bother me, but I thought I'd throw it out there in case someone else has experienced this:
When slowly climbing rough 4x4 trails, the van sometimes starts making loud low growling moaning sounds, kind of like like a power steering pump that's being starved of fluid. The sound comes in bursts, oscillating with the van's bouncing. Sounds like it's coming from the engine or below.
It's always done this, since new.