Welcome to JOF
I don't own a PUP, but I'm sure some PUP owners will chime in.
IMO your OEM tires when maintaining the proper PSI should give you acceptable performance within the load rating of the tire and should be fine.
When considering an upgrade on the OEM rim, also confirm that the center bore size and offset are the same.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)