How do I make a hinge constraint more stable?

So I have a rotating rollback towtruck I’m building. For those who don’t know their towtruck designs that’s a flatbed truck that the bed rollsbackwards and tilts to load cars. This particular variety also rotates side to side for say loading from a ditch.

Anyway, I am doing testing rn and am having this issue where when the bed is loaded with a vehicle, the rotating becomes erratic. Often to the point where it will desync and glitch causing the whole truck to essentially spazz like the product of a bad physics calculation. Here is a video showing whats going on:

So the rotation of the bed is handled by a single hinge constraint, its for a responsiveness of 45, a max force if infinite, a speed of 4. Altering these parameters doesn’t help and somewhat makes things worse from what I have seen.

Aside from that stuff I have tried every method I know to prevent this, I cant modify the vehicles permanently to make them more favorable as that’s not how it’s supposed to work. Some things I have tried to do include:

  1. Welding the entire vehicle to the bed.
  2. Nocolliding the entire vehicle being towed.
  3. Disabling any scripts in the vehicle being towed that can alter the network ownership of the truck.
  4. Deleting the Vehicle Seat of the vehicle being towed.
  5. Disabling any body movers and velocity constraints in the towed vehicle.
  6. Making the vehicle completely massless.

All these things and nothing has worked so far. What am I doing wrong?

My only theory is: The bed may be colliding with the truck somehow (maybe a small part might be reaching the chassis). Mix this with the infinite max force and a too-high speed for the bed (0.3 or slower may be better) and you get some weird spazzing.

See if something from the bed or the truck is too close to either object.

I have checked the bed, and aside from the deck boards (the wood part) everything is nocollide.

I am running out of ideas here. Nothing I have done so far has fixed the issue.