That's really cool that you can get a full 90 degrees. I could get 88 with my previous 5th but not so much on my current one.
I don't think there is hard fast rule and depends on if you pin is over the axle or a couple inches in front of the axle and how you the nose of the 5er is shaped.
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CWS, I hear you. It's all in the shape of the nose. My last one was a Heartland product and they went to 88 degree caps on all their lines. I still had to watch as 88 isn't 90 but it was a touch less watching than now with my XLR.
Kenny, that is true. It's also true that if you hit a tree while backing up your rig with a long bed or a slider it will also leave a dent. Not in your rear cab / rear window area but a dent just the same. Bottom line is paying attention is paying attention. Watch your clearance every time and you'll never hit...