We have both, there are some trips the camper is good for & some the van is good for.
We have a Trakmaster Kimberly, they were the only ones interested in even talking to us let alone looking at layouts. Bushtracker couldn't wait to walk away from us at one of the Melbourne C'van shows so our $ went elsewhere.
What I mean by my initial statement is that whilst its nice & a lot more comfortable in the van, I wouldnt take it to places like Fraser Is (More fear from me than anything, Id hate to lose that sort of $$$ below the high tide line) & quick weekends away.
We have so far taken our van to Cape York, Flinders, Vic High country etc. I wouldnt hesitate to take it most places. The places that I cant/wont take it are rarely a few hours drive away (Excluding places I wouldnt take the camper anyway)
Worst that has happened to our Trakmaster for the Cape York run was a Jam lid opened in the fridge, Dads "offroad" van snapped 2 shocks out of the chassis.
Watch your price, its the extras that kill you with cost. Compare them to see the quality of the chassis & build & what is standard & not.
Trakmaster, Kedron, Phoneix & BT (If they will talk to you) are all good offroad vans, but your talking serious $ for a serious van. Dont expect the same quality from something 1/2 the price.