You dont really have to hassle your way through the locks and unlocks.

If you dont have a dedicated button for the trunk release on your alarm (that is IF you dont have, and most of the cheap alarms out there dont), you have to press and hold the unlock button for about 3 seconds. When you do this, your doors will also be unlocked. After opening the trunk and place whatever you want to put in to it, just close the trunk to lock it and press the lock button so that you can lock the doors as well. After that, everything's locked backup. Problem solved.

Kung ung may dedicated na trunk release button ang bibilhin mo, merong Autopage na around PhP3000 sa Evangelista. Not sure kung orig though.