2017 Ford dually tire valve stems access help please.

I picked up a air chuck combo that has an angled head and adds air and measures the tire pressure as well. All you need to do is put your rear tire valve stem in a 3 or 9 o'clock position and it is relatively easy to add/measure. I don't use extensions and have no problems with the above combo. I picked it up at an auto store don't remember which one.