Just doing a few checks on my truck.. The tyre preasure according to the sticker on the edge of door frame ,, Say`s tyre preasure is 35 PSI front and Rear.. There is nothing in the manual about tyre preasures just says refer to sticker.. No mention of a little extra with a trailer or 5th wheel hooked up. Does anybody know if the rear`s should have a bit more when towing 5th wheel? Tyres are Bridgestone Dueler A/T, P275/65R18. Thanks.