MODERATOR's EDIT.
Brian @Kuhlbreeze just PM'ed me with his 1999 Diplomat Tire Data Plate. Based on the Hankook Inflation Table and his 10K Front and his 19K rear Axle, he will be OK at 90's or so. BUT, if he weighs and gets a LOWER inflation MOST folks would advise NOT TO GO BELOW 90...based on all the comments from folks and knowledgeable folks, most experts and our members say not to go below 90 for a MH tire. Therefore 90 all the way around will be fine for his Axle ratings I have attached the Photo to clear things up. Thanks to Brian for sending it to me...END of EDIT
I have new Hankook tires 275/70R22.5 load range J in our 99 diplomat wondering what tire pressures you guys like I was running 100psi in all seems like a slight harsher ride