The V10 spark plug problem does not occur until the plugs are replaced. The OEM plugs are rated for 100,000 miles so put that fear to rest. I'm at 10 years and 50K miles and not a hiccup.
Think of RV's in the same light as boats. The four foot gain from a 36' to 40' may seem small but has a dramatic effect. You may run into problems at government parks with a 40' rig but with preplanning shouldn't be much of a concern. If your budget will support a 40' diesel is a good all around coach if you plan to use it, a lot. As a first timer maybe a 36' gas coach s few years old might be a better fit for the first few years.
