IMO the Nashville explosion was a bombing. I base this on the following:

I was enlisted in the US Army and served as enlisted and later an officer before getting out. I served in an artillery battalion that uses lots of big bang stuffs.

I have seen cars blow up and burn from within 10-100ft.

I have used multiple types of explosives (i.e. Grenades, 40 mm's, "Claymore's", all that jazz) at one point or another and small arms rounds while in various schools in the Army. (I know what they look like after they blow).

That being said, when a vehicle explodes, it is usually from the gas tank underneath and the tires bursting from heat. You will hear mini pops and a larger pop/bang. I was personally standing around 10 feet from a car that was burning and blew up. It does not move, bounce, lift-off, and there was no "Shrapnel" to be seen. My vehicle was parked right behind the exploding / burning car... my windows did not shatter.

What does happen is a bunch of fire burning all the flammable liquids inside the vehicle consumes the vehicle in a fireball. There is no shock wave or blast that knocks you over, the only time I have felt a concussive blast was from Grenades, claymore's, and standing directly behind the battery firing line when they were sending rounds... We were a heavy unit with Paladin's.

The media narrative is saying RVs (there is a post on an RV/5-wheel burning floating around the Donald look at it for reference) or gas leak (More likely than RV scenario). Look at the drone footage that's floating around, the building is hollowed out and the blast looks to be radiating away towards the other building. All the windows in the area are blasted out with further damage to the facade of buildings. If this was a gas leak and explosion things would still be burning, and the building would not have collapsed from inside the way it did. The exterior would have been crumbled and shattered. The imagery shows the floors collapsed and a blast that radiates towards away from the building. Outside there is no smoldering ruins, wreckage, or any of that. It looks like the clean debris on the pentagon lawn after the "plane" crashed into it after the 9/11 attack. There was a warning going off on a broadcast speaker to get people to leave the area and "Alleged" gunshots going off. And a final note, in the recording

This looks more like a planned demolition or the use of "military grade" explosives.

Update: Based on the initial videos I saw there were no images of the vehicles out front. But in further videos there are multiple vehicles burning in the street out front. This had to have been a massive explosion to do this.

As a disclaimer, I can be wrong, just like anyone else, but this post is based on my personal experiences.