your owners "wallet" came with probably at least two booklets, say Michelin and Goodyear.
They would have load ratings for their tires at different air pressures.
Yeah, when unloaded you don't need them pumped all the way up!
Your tires will wear in the center, the ride will be stiffer, and the handling may suffer.
If you don't have the books, check the tire mfg. site.
Dodge left this info out of the owners manual on purpose, after all they are not a tire mfg!