Even though it is a 2 hour trip, take some vacation time with the whole family to look at the RV's. Look at several, while you walk around kicking tires, taking to the salesman about resale value, DH and child can be inside looking and "playing house". Mom can be standing at the kitchen counter, stove, etc. to see how the kitchen feels. Can she make dinner, etc. comfortably. The child can sit at the DR table watching TV, reading, coloring, or playing in bedroom or LR with toys. Can mom see child? Is there room to store a "few toys for child? etc.
Then see about renting one for a few days that is the same or similar to what you were looking at, go to a family RV park and "try it out". While at the RV park, you can talk to other people on their choices, etc. This way you can have the best of both worlds and check to see what fit is best for you.
Good luck in picking out the new toy.