Should I be worried about an RV that is too long?

To be honest, the learning curve is the learning curve. Maybe a 40 foot curve is a little less than a 35 foot curve, but not much.

Get what you want and will be happy with in the long run.

Take your rig to an open parking lot, use some orange cones, ropes, etc to practice backing into campsites. Once you have the knack of it, you will be fine.

Our total rig is 55 feet, 22,000 lbs.