As much as I like my Newmars can't say they have always been perfect.
98 KSCA on Ford chassis the chassis could not support the Newmar box and now in Ford chassis forum they still have support problems and driving control problems and people are using
their CHF to correct these problems.
The 98 coach I had leaf springs add all four wheel locations by a good spring suspension company and it vastly improve the drive ability and handling of coach, add new shocks and rear torque bar.
Newmar problems Corian kitchen counter would crack on slide movement in and out, reason they used 1/8" Corian glued on 3/4 Masonite board and to much flexing would crack the Corian. Newmar under warranty replaced the Corian counter to the 1/2" they were using in their more expensive coach's.
99 MACA same type problem with chassis only some what worst because the weight of box when rolling to the passenger side rear duels would scuff the top of the wheel well causing jolts when driving.
I did myself added
AIR -LIFT bag system because a Ford dealer said it could not be done. Added new shocks and rear torque bar also.
Newmar coach problems none everything worked and great cabinet work.
Both coach's were great driving after the corrections to chassis.
You might say chassis problems are not Newmar problems in a way they are when during that time period MFG's would extend the chassis rails to carry a longer box on a shorter chassis supplied by Ford which were really truck chassis to start with.
The newer Ford chassis now are designed for a RV chassis function because back in 2009 the new Workhorse chassis was taking business from Ford.
Workhorse had problems back in 2008-10 and went out of business because of
brake recall's and over extending their chassis market, so all we have for gas chassis are back to Ford only.
But word is out
Workhorse is coming back.
Now my Workhorse chassis is one of the best chassis I ever owned even with the brake recall and their front end purposing problem they had.
I corrected the purposing with new Bilstein shocks and had the brake recall done in 2008. Workhorse in 04 changed all shocks to the Bilsteins on their new chassis'.
The first drive of the Workhorse Newmar coach was like night and day compared to the Ford chassis' of old. Newmar at the time made a good choice going with the Workhorse for their bigger and heavier models.
Newmar problem this coach had the sewer line drop out of floor flange for toilet while on trip in Canada, after a days driving and use had a big mess end of day.
Pipe was never glued and pipe dropped into holding tank.
Fixed myself was lucky stopped for night at campground that used PCV piping for their pedestals so have plenty of glue for repair.
Other than that 2003 3740 bath 1/2 was the best coach we ever had.
Your interested in a DP more Tech stuff to worry about but greater driving experience and carrying and hauling capacity.
You can make some major changes to your dream coach by Newmar also.
Would I still buy a Newmar you bet over all the best even with some of the complaints by people on forum now.