Mine is 5" wide. Being for a kitchen slide, it carries a pretty heavy load. As you can see from the pictures, its carrying a gas line, four thick DC lines (a pair on each side) and three large wire looms carrying AC lines (one on the front and two on the back).
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam