"Wheels don't roll in these sand hills"
Here either, but at graveside, the final ceremony is usually on a covered slab, and there's a sidewalk from where the hearse parks to the slab.
Once the final goodbye is completed, and the last mourner has left, the coffin is left there on it's gurney on that the slab until the cemetery workers come to inter it. (Usually placed in concrete vault and then in the earth, via a backhoe)
(I was a pallbearer for a deceased active duty USN man in Louisiana about 25-30 years ago, and we had to lift the coffin up on top of a concrete vault, and then fold the flag with our arms up pretty high in the air due to the height of the coffin on top of the vault. They bury people on top of the ground over there)