I used the Goodyear chart for the 245/70R19.5 since that is what came with the coach. Minimum air pressure on the chart is 80 psi for both single and dual wheels. The chart says that should carry 3640 for singles and 3415 for duals. That is more weight than the coach as it sits so I run 80 psi, cold.
Are you saying the sumo springs has "dampened" the bumps of the road?
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings