Well the NVA had more than just Chinese Type-59's, they had a ton of T-54 variants and clones. However they mainly used the PT-76's since they were amphibious, as you can imagine they would be useful for country full of rice paddies, rivers, and lakes.
I know this, I chose one tank. I have list of weapons used by both the US and NVA/NLF. Also at the border of SV and NV, there are no lakes and the only river stems from Laos and any rice patty farms there would have been completely obliterated from previous artillery battery, infantry support, and armored vehicles.
I'm going to assume the M48 Patton is on stand-by because of the heightened activity so
"Okay crew, wake up! We have reports of T-59's and NVA platoons moving around. It is assumed that the Platoons carry AK's. We don't know if they have artillery support or air if they do engage us. I have a feeling these bastards are going to attack. Nobody moves around entire companies and then waits out a ceasefire."
Yeah they should be on stand-by. Remember you can create as much of the story as me or anyone else. Just follow history though.
Dan is outside of the command center, leaning on a wall that was once going to be used in a project building. He sees M48 Pattons rolling by. Immediately a large whistle is heard, a C5 Galaxy is flying low and right above Hue. A bunch of jeeps drive into the command center and more troop transport trucks are seen coming into Hue.
"What the hell is going?" He starts walking around from where he was, walks toward a post where an officer happened to be.
"Umm excuse me, sir?" The officer turns around and reveals himself to be a colonel. Dan straightens up immediately and salutes. The Colonel smirks and says "It's okay son, relax, I'm not a hardass until the war begins. What do you need Private?"
"Uhh sir, what's with all the cargo and soldiers being moved into Hue.?"
Colonel: "Reconnaissance believes the NVA are going to be planning an attack on the border, and we're the second closest to the border. This is was intel suggests, but they might do more than just that, so all bases have been put to a heightened alert in case of attack."
"Ohh. Okay, thank you s-sir." Dan salutes once again then walks off.
20.13 hours