A TANK TRUCK LOADED WITH DIESEL gently rolled over on its side Saturday morning on Sunray Road when the ground gave way beneath it. The driver of the truck, owned by Redbird and hauling for Transport of Texas, said he had moved over just a bit because of an oncoming pickup and when he tried to move back he realized his tire had gone inhi the mud. He stopped the truck and then the mud on the shoulderless road began to give way, the cargo apparently shifted and the truck tilted slowly until it gently came to rest on its side. The driver was not injured in the accident, but injured a foot when he jumped from the cab of the truck and landed on the pavement. Ingleside volunteer firemen stood by at the scene and blocked traffic on the road until late afternoon while the diesel was pumped into another truck and the truck righted.