</font><font color="blue" class="small">( I will be towing CK30 with fel and boxscraper.Local trailer dealer will make a great deel on a 9900 gvwr 14 ft double axle trailer.)</font>
Well, it depends on a few things, but I think you'll be sorry if you don't get at least 16' of trailer for that model. I have the CK20 and have used 12' and 16' with the 16' definitely being the ONE. Around here, it's cheaper to buy a 16' than a 14' as the 14' is not so common as 10',12',16' etc.
The CK30, with a loader, and a mower/backhoe/other implement hanging off the back would be much better on a 16' trailer. It can certainly be done with 14' but two feet makes a big difference in comfort level and ability to carry other implements along for the ride. John