Car Booster Using A Car Booster Seat In A Motor Home?

Using a car booster seat in a motor home? - car booster

My children and I are going camping with my parents next week. We will head into the camp in the RV. The back of the trailer is equipped with seat belts and says only manual of my son, he can not be used with a lap belt. It is still too big for a 5-point harness seat and do not want to spend much money on a chair with new versions of just one week.

Thanks

Heather