Tow bars on the front are awesome for positioning a trailer. You can make the trailer turn in exactly when you want, and so much tighter. Most importantly there is no worries about where the corner of the bonnet is in relation to the fence. I put one on the last truck attached to a nudge-bar.

I think I covered quads back in this thread.. Or maybe a similar one
Issue is not getting traction with tyres... And adding a couple guys weight over the wheels still becomes marginal a
On a slight slope or fine gravel/tar based surface