Fabtech rear shocks with front Bilsteins
 

Looking to replace my stock Rancho shocks on my 2012 Ford F350 SD SC 6.2 gas long bed. I have read posts from here that say go with the Bilstein 5100s. I have also read about the Bilstein 4600s. My understanding is the 5100s raise your truck and the 4600s do not?. So, my question to anyone is can you mix it up. I was researching the Fabtech FTS7333 rear shocks that are coilover. Thought of putting them on the rear and a set of Bilsteins 5100 or 4600 on the front. Are, should I just KISS and put a set of the bilstein 5100s on and be done with it?. Searching for a 5th wheel rv and want to get new shocks and the reese elite hitch before. So they both can be adjusted for height.
Back in the 80's Monroe did make a decent set of Coilovers for the F250. Lasted 11+ years for me till sold. I checked with them and they do not make coilovers to fit super dutys yet.
Any comments are appreciated. Just want to get setup, I have see some F250/350's sagging towing rv's.