We use honey-combed rubber cushioning material everywhere in all cabinets tucked in between all items and on shelf bottoms. We also use it in the oven between pots and pans stored there during travel. The rotating glass tray for the microwave is stored in it's custom styrofoam travel holder inside the microwave. The cooktop grates sit in rubber grommeted holes in the cooktop's steel top - and if just one of those grommets is missing quiet travel is impossible.
If we keep the V10 rev'd no higher than around 3500-3700 RPM when going up grades and it's sound is not irritable at all. Below 3000 RPM it's real quiet. It's above 4000 RPM where the V10's "music" starts. The V10's boost cooling fan is usually louder than the engine when pulling grades in warm weather ... don't Chevy V8's have whirring radiator boost cooling fans too?
P.S. Maybe lack of noise when going down the road is one of the reasons TT and 5'er owners like their rigs - as they can't hear anything going on inside the RV's living area when traveling. However, not hearing it could be a good thing or a bad thing depending upon what might be causing noise back there in the living area!