I know mine is not an RV, but I had the same concerns with the pin clamp, so two things I thought about before deciding on cables....1) go with a threaded end 2) use opposing "pull" springs onthe throttle arm to middle the throttle if the cable breaks....theres a long thread here on Vaf about that worth reading, and springs are used on some production models as well as for all engine control cables, depending on what you want the limp home mode to be.
In the end, I bit the bullet and went threaded for all, and will eventually go with springs as well for double safety, but havent engineered that yet.