OP here, I ended up purchasing one USI MI106S, which advertises the following:
- Combines the benefits of both Photoelectric & Ionization technology in one alarm
- Smart Alarm Technology virtually eliminates nuisance alarms
- Automatic temperature and humidity compensation continuously adjusts to variations in environmental conditions, reducing nuisance alarms
Which sounds like what I’m looking for. I’ll try some informal tests on it before I buy more.
Wikipedia says Europe uses mainly the shorter cab-over-engine tractors in order to maximize trailer length while staying under the total length limit. They commonly pull standard ISO shipping containers, so in that case at least the difference is all in the tractor.