CDAVES, wow that's quite a variety of engines and trucks. Your techs must have a nice time keeping all those straight. What is the highest HP Cummins you can get with the FL70? I think the FL60,70 series trucks are a little light duty for fire service,IMO. We are starting to see a few more CAT's and Cummins in fire service out here, since they can't get the 2 strokers anymore and the fleets are rolling over, still a lot of DT50/60 series though. I know the 4 Seattle FD articulated ladder trucks (don't remember the make,cab over eng) with CAT 425hp 3406b's I have worked on are a PITA to work on. Bad times running them on the dyno too. They are fun to drive though, they have the tender (I think that's what is called) that you have to drive from the rear, took one out on the street, takes some getting used to. Be safe out there.