I frequently transport mortors on a quad, thus am loading one mortor backpack onto the quad while carrying another on my character.
When loading attempting to get onto the drivers seat of a quad that has a mortor backpack loaded, the mouse action menu occasionally pops up ASSEMBLE MORTOR after I've clicked "Drivers Seat". The player then instantly assembles the mortor at the location of the vehicle causing both to explode.
Arma should IGNORE any mortor/bipods loaded into the cargo holds of vehicles to prevent this from happening. Having to take 10 seconds more to place them manually isn't worth the frustration of both exploding 2 hours into a mission.