Found some ARVN Tanks and aircrafts in Hue after 42 years

Nice...

Interesting collection.
What is that monster in the second from last picture?

That is M88 recovery vehicle use by 20th Tank Reg

Looks like there is not a whole lot of interest in maintaining the equipment to visually look like it is maintained or even to keep the grass/landscape clean. The Cadillac Cage Commando & M113 APCs are a good example.

I see a bunch of barrier chains, but a ton of open hatches. Ability to go inside the vehicles? Or not allowed?

Stupid communist government! They consider those are enemy equipment so they don't care just let those tanks rusty and parts stolen but they lose a lot of money from tourist