Decide what are the requirements and then rank them. I just installed viper 791xv, way overrated but okay.
MOST IMPORTANT - Primary Security Layer Reliable electronics of alarm brain 2 Way Pager to instant notify SENSOR: Doppler motion inside cab - Most reliable Passive GPS eg lojack
STILL IMPORTANT - Next Security Layer Siren battery backup Alarm brain battery backup Maybe tilt sensor for towing
LESS IMPORTANT - Secondary Security Layer 1 way pager - Least Important SENSOR: Shock Type - Less reliable SENSOR: Glass Break - Less reliable
LEAST IMPORTANT - Other Security Layer Dome supervision Blinking tailights Warn Away: Bells and whistles like tire kicking
what you don't see, eg motion detection, is more important than the visible eg tire kicking, flashing lights