Cabinet door above steering wheel opens and shuts violently when going over overpass

[Mickeylight]

2022 Essex, 5000 miles and we love it. But when going over overpass and leaving the overpass coach will sometimes heave up and down considerably just for a short time and this causes cabinet door just above steering wheel to open and shut violently, sounds as if a brick just hit the front window. Factory installed more magnets to keep it shut but it did not work. Sounds like it must be in the shock absorbers not strong enough to control the up and down motion of the front end when the coach is leaving the overpass and getting off the bridge.
Has anybody went to a different shock up front to eliminate what I’m experiencing? It settles down after maybe 2 up and down motions. This only happens occasionally but when it does it is scary, the noise from the cabinet door slamming gets your attention very quickly.
I’m driving at 62 to 65 mph. I mean I can fix the door from opening but I need to get the front end settled down when going over extremely uneven
overpasses.
Thanks Mickey Light, I have warranty scheduled in 2 weeks. Just want to get info for my discussions with service personnel at the factory.

[USMCRET]

I had the same thing happening. What I found was I was not always closing that door before putting it in drive.

The sound of that door slamming shut was exactly as you described, and I’m sure I wasted a few of whatever remaining heartbeats I have left.

[TheRod]

This up and down motion is called porpoising, likely caused by inadequate front shocks. Spartan agreed to replace mine. Call and inform Newmar you would like this addressed at your visit.

[Bobby Dowdle]

We upgrade the shocks to KONI shocks. The spartan chassis does have porpoising as Rod as stated. The shock upgrade will help that a lot. Reach out to your selling dealer or any NIRVC for assistance with this issue. The prop on the side of your door should have an allen head in the center. You can tighten that and it will help hold the door shut more as well.

[Rev. Roy]

Originally Posted by Bobby Dowdle

We upgrade the shocks to KONI shocks. The spartan chassis does have porpoising as Rod as stated. The shock upgrade will help that a lot. Reach out to your selling dealer or any NIRVC for assistance with this issue. The prop on the side of your door should have an allen head in the center. You can tighten that and it will help hold the door shut more as well.

I know that Spartan is now using Koni shocks on the K3 chassis. I am not sure if that started on the 2023 and up models or if it was also on the 2022 models. I suspect it was an upgrade for the 2023. This indicates to me that they are aware of the inadequacy of the former Bilstein shocks. However the K2 chassis is not showing this upgrade.

[Sugaree]

I just contacted Spartan and they gave me a run around that the Bilstein shocks are appropriate for the front suspension and replacing the shocks is not a warranty item. Spartan must know these shocks are inadequate.

[Clemson]

Wrong approach IMO. Instead of telling Spartan you want new shocks you should have asked them to address the porpoising issue IF you are having this problem. Telling an OEM what the fix should be never goes far

[Sugaree]

Originally Posted by Clemson

Wrong approach IMO. Instead of telling Spartan you want new shocks you should have asked them to address the porpoising issue IF you are having this problem. Telling an OEM what the fix should be never goes far

The porpoising has been a known issue for a long time. The bilstein shocks are woefully inadequate for a 20,000 lb axel.