I have a 2017 Miramar 34.4.
It really drove like crap before getting a front end alignment. Once that was done it was much more bearable. I wrote a bit more about that
here on our blog.
I have 2,000 miles under my belt now and I am just now getting the hang of it but I'm still a bit tense at times driving it especially in windy conditions or when semi trucks or bigger vehicles pass by too quick. I'm still not 100% comfortable passing other vehicles yet.
Driving this rig requires a lot of mindfulness and I'm comfortable only doing about 300 miles a day or so, max. I'm assuming the comfort level would go increase if I added some suspension tweaks, but as of now it is manageable.