Likewise! I just finished my install. I used a 25' extension cable on the RV side. When I finished installing the cable from the back of my RV to the generator compartment, I had way to much cable left over combined with the 25' extension. I would have been just fine with a 5' extension. My rig is 44' 2" in overall length. I did however run the cable straight from the 5th wheel pin box via a conduit I installed under the vinyl skin to the generator compartment. From there I ran the cable under the coroplast. Straight line back to the center bumper of my RV.
Camera mounted on back of RV...
Camera cable docking station on rear of 5th wheel pin box. You can see the grey conduit I ran and caulked off.
Moved camera port from rear bumper to bed. When I moved the cable underneath the truck... I found that I had PLENTY of slack to put it close to the 7-way without using an extension. I did however decide to move it further down. If I had to guess I had about 2 inches of slack left over if I were to mount it close to the 7-way port. Long enough that the cable would have a gentle bend to it... far from a kink.
You guys were right... the blank cover was $10. But the shipping was $15...
Normal "rear view" camera mode...
Trailer "rear view" mode... no issues at all. Image quality is quite nice. No flickering. My only wish is that I could "zoom" out. I can pan the camera up, down, left, right... and tilt it clockwise or counter clockwise.