The reality is that all three of the vehicles that she has listed are small Class C rigs. None are B's.
So perhaps she needs to go over to the Class C board to find people who are familiar with these rigs.
This really is the best advice. Through no fault of the original poster who is new to RVing, the listed “B” RVs aren’t actually class B but really class C. Having moved (happily) from a Class A to a B I can tell you that a B and C are quite different.
That said, given the description on how it will be used I think the OP might want to consider a true class B. The problem there is that true class B units cost more “per square foot”.
Dave