Not a fan of the packup. A forward point is a serious investment that should be able to be removed via some focused indirect. Allowing it to offer all its strengths and then just bail if things develop is either too lenient for somebody pushed back or way too potentially dominant for a player who can truck creep their HQ up the map one zone at a time
The CoH Brits proved that this isn't the case, nor I find it to be in the All Units Mod either. It takes a long time to setup and unsetup which means that if as you said somebody focuses indirect fire on it it would be dead regardless if it could move because it's a fragile structure and vehicle when converted.