You need to find out from DRV what type of disc/hydraulic brake system is on your trailer. There have been numerous mentions of problems with Ford controllers and DRV electric-over-hydraulic systems. Usually cured with an optional gadget called an HBA-Cam?
I will bet someone soon will chime in with the correct name for it. I believe that Carlisle is the brand of the controller?
And, technically, a 450 is still a 'light-duty' truck, but a good choice to pull the Suites trailers.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired