Originally Posted by 2010Prostar197
If I measure where the tube and main channel come together it measures about 4.5 inches.
In my picture the black winch cover (on the right side) and then straight down is the main tube which is 4.0 inches.
Never heard of 4.5 inch channel but I guess it's possible. The bigger trailers use the 5.0 inch tubing. Side to side is 3.0 inches on mine
Got it! I was having him measure the actuator outer shell piece... not the main tubing of the trailer. I'd be willing to bet that the main tubing on my trailer is also 4", and not 4.5". Thanks for the help... looks like this piece is also compatible with boatmate trailers that used the Reliable actuator. Thanks so much!