Im on b14's that i fitted myself and fine fettled to get her how i wanted...
i guess they could get to the near maximum of their travel but should firm up to avoid that... certainly shouldnt bang as you describe!?
i run 275 40 20's and im kinda up to the top on the front threads... looks the part...but not silly low..
the coooooomfiest bloody van i have ever been in... i catch the arch liner once in a blue moon... harsh dip in road etc perhaps..
on about maybe going 265/40/20 on next tyres just to assist...
used to have just h@r springs on the t5 i had and it was ok but nothing like now..
love mine... love the ride... may even put the roll bars on at some stage.. (when i run out if crap to do lol)
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I use to catch the arch liner too when i had my 20s, i was running all the way down on rear and 15mm up on front