Yes 14" are doable. I think max is 15" though.

 

 

Before doing anything check your forks. But first let me tell you my experience. I have a XL883L, or SuperLow, bought new. Ride comfort was pretty bad, so I went over it with a fine-tooth comb. What I found was that my forks sagged over half of their total travel - I even had the dealer strip and check them over under warranty. I have since installed single-rate fork springs, set sag correct at 1/3rd travel and the front of my bike is now around an inch higher. I also have new longer shocks a little over 13", so my bike sits level and rides a little higher - a Super-not-so-Low!

I don't recommend using really long shocks, in fact don't see any reason to do so. If you want improved ride quality then buy yourself improved quality shocks.

 

 

I put 12.5" Progressive 412s on my 2017 XL1200T along with Progressive Monotubes on the forks. Made a world of difference. Never bottomed out again. No need to go all the way to 14" IMHO.

 

 

Be assured that as soon as you put decent shocks on you will discover how poor the forks are!

As already recommended, check your forks first. My money is on them sagging too much at present. IMHO 13" shocks, or a little longer, should be just fine and be a good stepping stone to upgrading your forks later.

Take a look at the suspension reports by HDF sponsor DK Customs. They don't cover all brands by any means, but do give some good guidance and recommendations - may even give members a discount!