New to RVs with a 2021 View 24D

[WillowRider]

We're new to what we're calling a life of Easy Livin'. We retired in 2018 and in 2019 moved from California to Arizona. We were just getting settled and opening our Trips to Take journal when the Pandemic hit. After most of the year barricaded in our new home we came up with a workaround to the generally universal aversion to what had been normal travel, buying last Fall a new, 2021 View 24D. Some 5,000 miles later, we're still enjoying immensely both the View and the freedom and flexibility it gives our love of road trips.
Our first few trips were for no more than a day before extending to a couple 2-day ventures early this year. The latest was a 4-day return visit to California. We were shocked at the diesel prices, having become quite used to Arizona's, but appreciated seeing more green in three of those days than we have over the past year at home.
All was well with the View until we were within a couple hours from home. Abruptly, without any warning signs or lights on the dash, the View's engine began thumping, at first lightly but then increasingly loud and heavy (it wasn't an engine knock; our first thought was a tire going flat). It lessened as we slowed and fully abated when our speed dropped below 45 mph. None of the onboard sensors indicated any problems. We crept off the freeway and found a multi-use service station (cars and trucks), where we parked. We had refilled the DEF before leaving but just in case, topped it off again. Engine oil level was unchanged. There were no signs of leakage or anything else untoward under the hood or under the vehicle. We had been traveling with the traffic flow, generally between 70 mph and 80 mph. We had refueled in Quartzite and decided to do so again. After pondering matters for about 45 minutes, we decided to start the engine and see what happened. It started right up and idled normally. Hoping what we had experienced was transient, we resumed our trip home, albeit at slower speeds than previously. Two hours and about 100 miles later, we were home with no repeat of the thumping. We have since checked the engine/drive train with an OBD-II scanner, which showed everything well within normal range. We will be taking the View to the local M-B dealer this week but will appreciate very much any thoughts on what may be the cause of this problem.

[SeeTheUSA]

It’s the kadiddlehofferfinkleflap ... Winnebago puts then in at Forest City to alert drivers they are going too fast.

Hope that helps. Seems slowing down helped. Nice rig, enjoy the ride.

[WillowRider]

Thanks, we thought of that. When it happened, though, we were urban freeway speeds, below 70 mph and had been for some time. It had not when we were at the higher speeds. Would the engine still be requiring a cooling down at that point?