Game Version number: 1.2.0.52
Modded?: (No)

Currently Supply being the main resources for radio backpack spawns is a great change in exp.
The issue is in relation to vehicles and the trash clean up system. If i set up a pack connected to a vic in a garage or grove outside a point to attack it's all well and good, until i get distracted by having to defend another point, or if i end up away from my pack for long enough that the trash clean up decides that the vehicle isn't being used.
I believe this is unintended behavior.

You either have to baby sit the vic by interacting with it ever so often or risk losing the main supply for your radio. Some kind of check or ownership validation would be a nice solution.
If this is intended behavior that's fine, degradation on supply/vic over time is still valid but i as a player would like to know that's happening, rather than trying to use a external timer or estimation. The ability to build a small/med camo net without the full truck would also be nice and help conceal your set up position.