Curt, ours is single rear wheel but wanted to comment I would guess the higher pressure in the front is because of the weight of the diesel and the lower in the rears is because each tire is supporting half the weight (roughly) that the single rear wheel truck rear tires. Ours has 17 inch wheels also. The recommended pressure is 75 all around. Towing I run 65 front and 80 rear. Same when not towing unless in an area with rough roads. Then I run 65 all around. Tires are wearing very nicely, flat across the tread, with almost 29k miles on them.
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