We had a cross training exercise with the FD here. It was an extrication drill. We responded to an "mva" with entrapment. We held C-Spine while the Fd extricated the patient.
You can do this without the fd or extrication. Just extricate someone out of personal vehicle in the parking lot. Put 4 people in. Have a little MCI. Have the inital unit set up a staging area, triage etc etc.
Curious... what type of vehicles/apparatus do you have since you don't do any transports? Or when you say you don't do any transports do you mean that you don't do interfacility transports.
We generally have two ems and two fire drills each month. We like to have at least one of each be a hands on practicals. As far as integrating fire personnel with the EMS drills, it depends on time and what kind of work they have to complete for the fire side.
Extrication once a year, definitely. We get a local junkyard to donate an already wrecked car, put a dummy in it and tear it apart and extricate the patient. The FF's are asked to practice anything they might be asked to do in a real call.
Being a volly station, we can't always count on full EMT response on a scene. For that reason, I like the FF who shows up to drive the rig to the hospital to be able to move the stretcher in and out of the rig, be able to turn on the O2 for me and to know what I mean by "Grab the airway kit, or Monitor and bring it in for me"
We do train all the FFs in Industrial First Aid and HCP CPR. I like practicals to be as reality based as possible. So I occasionally chose scenarios where it's just one EMT and 2 FF, just to get practice dealing with that definite possiblity in the field.
Unlike yours, my ambulance is part of our fire department (I was a firefighter before I became an EMT). Many times (more than none) the fire department is "toned out" along with the ambulance so we work closely together most of the time. As a matter of fact I think 12 out of our 13 EMT's are firefighters themselves..
Anyways like others have stated MCI drills are important. We also do Extrication drills. I have learned that many of the FF's do not know how to do a rapid take down. That could be another part that a firefighter could help with. I know that sometimes with bigger patients I would rather have someone a bit stronger than myself aiding in a rapid take down (and know that they can do it right)
This upcomming month we are going to do an ice rescue/ cold related emergencies drill. This includes those rope rescue certified skills, then EMS will intervine and practice their skills (dummy or fake patient).
One thing that has worked well in our department is a "find it" game. We will ask those who are not firmiliar with our rig to find an item on it so they become firmilar with it, its uses and its position on the rig.
Maybe you could look at the types of drills that the fire department does and try to apply EMS skills to theirs.