This old chestnut comes up so often that I'm finally inspired to mention something about it.
Originally Posted by shrub
First of all I'm sorry if I offend, it's difficult not to when comparing sizes (see my signature).
To a pure number cruncher that knows the angles necessary to get their little Land Rover or Jeep or Hummer through certain obstacles it can seem that the off-roading ability may be compromised.
But size makes up for it!
Bear in mind that in its current state that wolf hunter can happily drive over and/or up a 60 cm step! (that's two feet in obsolete speak). Can the cars from which all those theoretical angles come from do that in stock form?
Departure angle is around 20°; horrible I hear the naysayers shout. In 90% of off road lorry driving that's plenty. My lorry came with a fixed underrun bar that only gave 14°, that didn't stop me following a friend in a Landy through some nasty dips, river beds and twisters (in fact I improved the trail because the bar smoothed it out when it scraped).
Remember that even with the "horrible" departure angle the tails of those Zetros are around 110 cm off the ground!
When you get onto 365/85/20 or similar a whole new set of rules apply. The power/weight is pathetic but the truck gets through stuff just as well. The angles are all "wrong" but the trucks happily swallow dips and steps that will tip unmodified cars.
Car owners just don't seem to get this.
The only place you're going to get a sudden transition from flat to slope greater than 20° is in a trialing situation; and if you're throwing yourself at that then you've chosen the wrong base vehicle. Look at all the Siberian river crossing videos, they're extreme but the trucks have even worse angles.
Having said all that I personally don't like the Zetros. Too much nose; stick the engine under the cab and you get an extra 150cm of living space. But that's only my take on camper building.
Now I don't want this to degenerate into a flaming session which is why I apologise again if this is taken wrongly; but to really appreciate these big beasties with their floppy chassis and poor angles you have to actually own one.
Mine is probably bigger than yours.
(isn't that what those long signatures are about?)
I'm talking about my truck, what were you thinking? ;-)