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The brake performance envelope between heavy vehicles in combination on New Zealand roads is very large and the reasons are many. Recent legislative changes to allow 44 tonne Gross Combination Mass were accompanied by a demand from the authorities for more uniform brake performance from vehicles in combination. The 1991 NZHVBC is based on unprecedented control of brake threshold as one of two main constituents to improve compatibility.

A new trailer suspension has been developed to incorporate many of the technological advances that have found their way into other automotive applications, which has resulted in a dramatic improvement in towability. The suspension is aimed primarily at travel trailers, horse trailers and special purpose trailers where good ride quality is an important factor. Two significant design changes to trailers have resulted from the application of this new positive steer suspension, namely, single axle applications replacing tandem .suspensions, and reduction of hitch loads down to 3% of trailer mass.