I have 4500s with a heavy camper. They are the ball screw type. I have one that I've been using manually. I have re-greased them and they turn very easy. I haven't seen any issue like this with mine.
I've been thinking about upgrading to 4800s (acme screw) but haven't found a reasonable deal on them in the past year.
Reading all the rants on the forum, I've thought about switching to Reico's, but I'd have to change the whole system which they are very proud of. The 4800s are also rated for more weight.
You do realize we are starting a "mine are better than yours" rant.
Which model failed on you?
