Hey Sebastian,
I have some ideas for some new trucks.
First - a water tender - can be used on any fire call and usually carries 2 people
next - a brush truck - is usually called a booster in the states - can be used on small fires and brush fires - usually carries 2 people
next - a hazmat truck - one that is separate from the heavy rescue - used in any hazmat situation - usually carries 4 people - would have to create a new call type