msturtz wrote:
Ultimately, your family is safer in a motorhome vs a car the seatbelt just keeps them in one location if an accident occurs or if sudden braking is required.
Your family is safer in whichever vehicle is driven more safely. Probably on the whole, most motorhomes are driven more carefully than most cars, allowing a greater margin for reacting to changing situations and avoiding really bad weather and operation by impaired drivers.
In the event of a crash, I'd much rather be in a modern car than in virtually any RV. There are far fewer things to become missiles in a car, and the structure is usually more crashworthy (and would stand up to a rollover far better). A car also stands a better chance of being able to avoid a crash in the first place by quicker braking or maneuvering. Cars typically also have better crash protection systems like airbags and shoulder belts and active headrests and well-engineered crush structures in front of the passenger cabin.
In some situations, such as multi-vehicle collisions, the additional mass of a motorhome is an advantage. That's about the only inherent advantage over a car that one has in the event of a serious accident.