As far as locks and locking up the doors I will chime in with some personal experience:
I also own a "nice" Jeep wrangler that has a soft top or no top during the warmer months. I have several very strong steel lock boxes mounted in side and they stay locked, but the doors are ALWAYS unlocked. I mention this because my neighbor(also with a soft top Jeep) locks his doors. One morning I came out to find the on my jeep "blowing in the wind" and looked around inside and nothing was gone, but some things were rearranged in the door pockets. I looked over and the windows on my neighbors Jeep had been cut open and were also "blowing in the wind". I would rather let the crook in and see that there was nothing worth taking than have them cut up a $200 set of windows and then find nothing inside.
The only thing I have in the basement that has any real value (unless someone is trying to steal out of season clothing) is a 300-400 pound tool box.
Just remember the a lock is only as strong as the door it is mounted in. the new aluminum doors might be rather secure, but the old tin and Styrofoam doors are a joke, they will flex enough to bypass any lock.
If someone wants in, they WILL get in, the only thing you can control is how much damage they cause getting in.
Just my $.02