Cables are rare on an RV...most use pushrods, bearings etc. The 12 has cables for the rudder which are a non-event and the stablilator which requires turnbuckles which have be adjusted, then locked (or safety-wired). Since they are down in the same area as the under the floor as the fuel tank plumbing you want to use the locks. The "grove" is almost impossible to see (draw a line over it with a blue marker) and it must line up exactly! with the notch....if it does the the blue locks slide right in, if not...line em up again. They are not resusable. You need four and Van's sent four. So double check your tensionmeter again before you lock em in. Yes...borrow one...$500 is a lot of money for two cables work.
