http://www.funfairs.ndirect.co.uk/Newcastle_04/
I was brought up around trucks like these, espesially the ERF's (our family know more about these trucks than the dealers ever did!) Though the volvo's and older skania's are becoming increasingly common.
I never thought about the twinsteers having better floatation but givin the grounnd conditions these trucks have to cope with that is probably an advantage of them.
Wish I could find a picture of the travel trailers we used to pull. These things are seriously big, especially considering the fact that most of the ERF's where gardner 180hps!
Infact, my granparents had a truck conversion before most of you had thought of them!