Having had a propane whole house generator and used it through many, many multiple day outages (up to 12 days) I'd bite the bullet and get a diesel generator if I needed one.
The ease of refueling, and longevity of the motor are 2 big pluses in a diesel generator. The lack of common spare parts espeically in widespread outages is a major downfall to a pp gen. Find out what the local "generator rate" for pp is if this will be your sole pp appliance. If you rent your tank you will lack the ability to shop for propane suppliers.