Nice looking trailer. What is the width between fenders? I am about 4 inches wider than stock so I have to be very careful with that. From the pictures it looks pretty tight for a stock width Sling.
As Van stated, there is 83.5" between fenders, BUT, you can pick up another 2" by very easily removing the fenders, takes just a minute with large knobs to turn. Call Van for custom specifics, they're always devising new ways to pick up more width.