Did your old trailer have shocks ??
Shocks or the lack there of can make a huge difference in the handling of any trailer, also floor plan ; rear bathroom or kitchen ; things in the rear of a trailer or 5th wheel see much more movement than over the axles or forward of the axles towards the hitch.
Something to watch for . Wife's cousin had a Mor-ride suspension 5th wheel and was constantly having stuff thrown around inside. After a big fight with the company a mechanic found that the suspension under his 5th wheel was designed for a 5,000 lbs heavier unit, making for a very rough ride.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.