MoreOddThanEven
New Member

Mine is a 30RDB. The slide is 11'6". The Solera that fit is 12'6". The W is 48" to accommodate how far the slide extends from the trailer body. I can't address how other brands span the slide...they may have the same 'gap' adjustment as well.
Mine is a 30RDB.....snip
I have a 2017 27DSRL and the slide, flange to flange, is 11’9”. That lines up with the gutter above the slide, which is where I believe you attach the slide topper awning. Been thinking about adding one myself so please let us know how the install goes on your Whitehawk. Good luck.