If the ramp is attached to the back of the deck like the ones at the big box stores, the only way a 10 foot will work is to have the ski tips hanging over the front of the trailer. I have a 10 foot long tilt snowmobile trailer with a slush guard. My 146 hangs off the back of the trailer about 8 inches. If I did not have the slush guard, it would just fit. If the trailer you are looking at has a front frame, I do not think it will work. The ramp will hit the back of the sled with a 151.
I would take a measurement from ski tip to the snow flap and take that with you when you look at trailers.
2018 Skidoo Summit Sport 600
1996 VMax 600 Mountain Max
1994 Indy Lite GT