First, welcome to the forum. You're in the right place for the best info (and a wide range of opinions).
I'm in the same boat as you. What I do is stand outside and lean inside the truck (I have a Ram) and handle the loading/unloading out of casual view. I sometimes do it while seated inside with the door closed, but that could present a problem if a LEO wanted to nit pick.
Also, get in the habit of carrying some OC Info cards for your State in your pocket so you can pass them out to anyone who questions you about why you carry. Vista print is a wonderful thing.
And absolutely be intimately failure with the applicable Statutes.