The problem with being in the "full psi camp" is that chances are excellent that you are over inflating your tires. If by some miracle you are not and in fact max psi is what the load calls for you are screwed if your load increases at all. In short you have no room to haul any additional load. Add to this the fact that you are trashing your RV with every bump and road joint, why would you want to do that? :h
If max psi is appropriate for your load you would be far better off getting a tire capable of carrying more rather than risk disaster due to being under inflated when your load increases. If your tires can run well under the max and be matched to your load you have a simple option when it comes to increasing your load... merely increase psi. In the real world very few people run lighter loads over time, quite the opposite.
:C
