They should be a six lug wheel to carry load E weight. But if you are looking for a little extra wiggle room over your current tires you can look on back side of wheel your supposed to have psi embossed on wheel. I contacted lions head to get psi info. Max 65 psi for me. I'm thinking we have same wheels.
2016 Ford F250 XLT 4X4 6.2L
2015 Rockwood Signature Ultralite 8329SS
Nights camping in 2016: 19 nights
Miles traveled in 2016: 2,575