When we purchased our Bighorn 3575el I looked for a trailer with a dry pin weight of less than 2500 lbs, as I was going to tow it with our 2015 RAM 3500 SRW. The 3575el has a dry pin weight of 2435. I talked to Heartland to verify that the stated weight was acturate. With everything loaded for living full time in the trailer for a year an a half I was at 6700-6800 on the rear axle and 11740 pounds on the truck. So if I started with a trailer with 600-700 more pin weight I would have been over the rear axle. The truck is registered for 12k in the State of Washington, so being a little over the GVWR of the truck, is not an issue, and I can raise that to 14k by paying for a little more tonnage per year.
So the OP's main issue is he chose a trailer with to high of a dry pin weight out the gate. While looking for our new trailer I found only the smallest Cardinal, we were replacing out 11 year old Cardinal, had a light enough pin weight and only the smallest Montana was within the weight we needed. We did not like either on these two. Cedar Creek was in the running with one of their models, except I did not like the interior decore.
OP should also talk to one of my AZ buddies about his trailer from the same manufacture, as he was leaving AZ for the factory to fix issues on what he says is a P O S trailer before returning to BC, Canada. LONG way home.