rear lift axle trailers

Hi
The company that I work for has recently acquired Don Bur, SDC and Cartwright tri axle rear lift axle trailers. The axles are slightly more forward than our normal tandem trailers, this is to allow for the fitment of an underslung tail lift. Since we have had them we have had 6 accidents where the rear of the trailer has swung out and caused damage to property and vehicles. I was wondering if anyone else has had the same problem. Due to the nature of the businesses we do not cary much weight, therefore the axle remains in the raised possition when driving, this along with the axles being further forward seem to change the pivot point when turning. We have been advising drivers that when making tight turns, to take a lesser angle of approach than they would with a tandem trailer.has anyone had the same problem and would the advice given be correct. The manufacturers dont seem to have any information on this issue, so any comments and sugestions are most welcom.