Welcome Lecat.
The rising rate front spring kits are almost ready and I have ordered a set. I have had a whole saga relating to ride height on a 2012 Plus 4 and have already had the springs changed under warranty. The ride height problem has been resolved but I am not entirely happy with the, now, rather firm ride. I have decided to fit aftermarket improved suspension to resolve both problems.
Send me a PM with your email address and I will send you all the information I have.
Q: I suppose the rear shock absorbers should be changed to match the new ones in the front. Do you have any suggestions on what make and/or type ( I would prefer adjustable)?