WHEN SHTF, my weapon is attached to me at the hip, complete with DUMMY cord. If I sleep, she is there with me, If I Pee, she is there helping me hold my GUN...
I think your LOCAL Laws dictate on this topic.....
In Texas it is PERFECTLY legal to walk down the street with a rifle or shotgun slung over your shoulder..... PERFECTLY LEGAL..... however I can GUARANTEE you will raise the attention of ALL LEO's within a 20 block radius if you care to attempt.
In TEXAS it is NOT Legal, AT ALL, to leave a weapon unsecured in a vehicle......
I realize that all of us have done it..... going hunting, stop off at the diner outside the gate to the lease and every one of the vehicles in the parking lot has several weapons in them.... mostly unsecured.... HOWEVER, most everyone in the restaurant may also be carrying legally, CHL is a breeze here in Texas.
Bottomline is get a box or rack for the floor behind the seat and LOCK the weapons up and then protect them (cover) from wandering eyes....
I personally prefer an axe handle that has been modified to fit the Gun Lock behind the seat..... cause my GLOCK is ALWAYS strapped to my hip...... but it hurts my ears when fired.....