Many people travel alone in a camper van or motorhome. I did so in 2006 through western Europe, and had a great time. It is easy to meet other people when travelling. Whether you are staying in campsites or free camping, there are friendly people everywhere. Other travelers are generally easy to approach, and most will speak English. Some people will be glad for someone else to talk to. If a couple or group of friends are travelling they are often glad for someone else to chat to and share stories and travel information. When free camping in surf locations you will find several people travelling alone, and its easy to find someone to surf, eat and drink with. Solo travelers often travel in convey from place to place, one they have met up someone they get along with.
If you are thinking about travelling alone don’t be put off. It can just as rewarding, and sometimes more so, than travelling in groups.