Do you have a pic of your trailer? As I have recently built another ski and only have a small single place stand-up triailer that I am looking to get rid of once I can get my hands on a 2 place stand-up trailer and it sounds like I would be able to convert the one you have into a 2 place stand-up trailer if it is as big as you described.
I successfully put 2 stand-ups on this trailer (barely) and it looked like it was the right size with just one ski on it
http://www.shorelandr.com/pages/t_specs.aspx?type=pwc&productID=4579
Frame Width: 44 Inches
Width Between Fenders: 46 Inches
Overall Width: 59 Inches
Not sure how you managed to fit 2 skis on that trailer with those demensions, but I would guess they are smashing into each other as you drive down the road. I am not looking to cut it that close as I have an max overall width of 90 inches in order for it to fit into my garage without issues. Ideally I would like to keep it at about 85 inches overall to ensure there is plenty of clearance on both side of the skis and fenders.
heres mine...
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