Our motor home is 42' 10". We've full timed in it since 04'. I cannot imagine any difference in driving a 40'er or a 45'er. We have never been in a campground that could not accommodate us. In fact, the great big rigs usually get the extra large parking spots. The only limitation with a big rig is getting into some deep woods forest service campsites. Actually, you would have the same limitations with a 40'er. One issue with a longer rig is you many need a somewhat flatter site than a smaller wheel base rig. It likely takes a bit longer learning curve to learn to back the 45' versus a 40'. When you do get parked the extra few feet is worth the extra effort. IMHO