I saw 17° while roosting a dune, I had a lot of speed and centrical force at the Apex where I still felt comfortable..
Had I lost lost my momentum and come to a stop it would of been a different story...
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Unfortunately the Ranger does not have a specific number to stay under. It would be nice to know, but I'm sure Ford has decided that with all the changes individuals will make, the number not to exceed will change.
That same I know some vehicles like my 19993 Pathfinder can go to 30° that's to what the manufacturer has rated it for. Best part was I had to source a clinometer gauge set from overseas since it wasn't offered here in the States
Here is a general thing from a page on Facebook I follow. Couldn't help but get a good chuckle out of it!!