Renting an RV and carseats?

Allysa

We have a family reunion with the in-laws waaaaaay up in northern Manitoba next summer and we were toying with the idea of renting an RV to make the 1000 mile one way trip a little easier on my terrible little car riders. Air travel is out of the question as tickets are $1350 a piece. We would split the cost of the RV with my SIL and BIL and also my MIL. So we would have 5 adults and 5 kids aged 12, 8, 4, 3, and 2. Does anyone know the regulations on car seats in RVs? I can't find any definite info online. Is it even possible with that many kids?