This thread is getting silly. Easiest solution is: Leave credit card, cell phone and wallet in the safe at hotel.10 dollars in a plastic bag in BC pocket with car key. 10 dollar sunglasses hidden in the truck.
I think the problem is OP started with "we haven't been to Bonaire yet", presumably they're going by all those "Bonaire crime is running rampant" threads. The reality is a) the chances of your truck getting hit are pretty low and b) you'll be 10-15 minutes away from the hotel most of the time, you don't need to drag stuff worth stealing around with you.