I to am sorry for your loss and just wanted to add a few items regarding fire safety. I was a volunteer firefighter for a number of years and these are a few things I can recall from that side as well as this one. Remember a large number of fire departments are volunteer especially in rural areas. That means they are in bed just like you and when the pager goes off the must go to the station, get the truck and then get from the station to you. So don't count on the fire department to save your barn. Even a full time department down the street would have problems saving a barn once its burning. So the reality of it is you need to do everything possible to keep it from catching fire in the first place.
Next a lot of farm lanes/driveways are made for things other than firetrucks to navigate. Get with your local fire department to make sure they are able to get fire apparatus from the road to your barn do not assume without verifying it.
A water supply is crucial if you don't live in an area with a hydrant. If you have a farm pond, ask your fire department or local municipality about putting a dry hydrant on it the fire department can access in emergencies if its close to the road, or something you can do for your own property. Again they have to be able to access it with a heavy truck. Yes they carry water but its not enough for a barn fire.
The best prevention is getting heat alarms and smoke detectors installed in crucial areas preferably wired to your house. Again ask your local fire department for advice on specifically what to get and where to put it. They are firefighters because they like helping people. Most of this stuff is free except the equipment. Most fire departments like when people are proactive in fire prevention and are more than willing to do these things. They may even enjoy seeing your farm and meeting your animals! For the little it will cost you to install the heat and smoke alarms, I assure you they are worth their weight in gold if you value your livestock.
I can add one thing about access to your property. We live in a rural area and we can't see the nearest house. My neighbor had put up a locked gate, he even locked it when he was home. We had no crime in the area but I guess he felt safe like this. One day he had a stroke and called 911. When they got there they could not get in. The extra time it took to find a way around and get him out to the ambulance almost cost him his life. We did loose a town hermit who had used a bulldozer to block him in, same thing but because of this he died while they were getting to him. The point of all this is to make sure emergency responders can get to you