My first response would be to ask what kinds of problems are you having? When you actually take a look at the systems in any trailer, almost everything but the 'box' is manufactured by only 2-3 major suppliers with that end manufacturer just installing it in said box. Yes, there are quality levels of the system parts, but like your stick and brick home's washer and dryer for instance, basically the same but with different control options. Are you having probles with those systems or the 'box' integrity
Now, with that said, I did look at 2014 and early manufacture 2015 Columbus 5ers and they did have some positives, the salesman for sure wasn't very enthusiastic over the line though the company closer (owner!!) sure was pushing them almost to the point of being obnoxious.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')