Mtb, thats a big fire load if you ever have an ignition source. The thing is the cars and garage would be enough to catch the house on fire so adding extra fuel maybe doesn’t matter. Attached garages are lined with 5/8″ drywall to contain fires. Most of the time that works. 25′ is not much but it helps. Fortunatly the logs of your home will withstand a lot of heat. You might separate your resources so all your eggs are not in the same basket though.