Panzer Elite in vCoH had scout cars. They costed no fuel, although they came from the one tier building that didn't contribute to panther battlegroups.
These units did not suppress unless a 50 muni ability was purchased, and then the unit had to lockdown, becoming immobile, and only then would its gun potentially suppress. Locking down and going mobile took a few seconds, just like HMGs. But it also locked down the territory point, and could only deploy in friendly territory.
No one used it for this, because it sucked enormously in this capacity. It did, however, work against snipers a fair bit, but it was ultimately how the PE faction could OP territory. But mostly no one would go the auxiliary tier and spend munitions JUST to get the only non-doc unit that suppressed. (Until G43s finally caused true suppression.)
Now, for comparison, the kubel does not have to upgrade anything, doesn't have to become immobile, can suppress enemies without any setup or tear down, and can do so on the doorstep of enemy bases. Plus, I believe, it doesn't require any teching to field.
There's totally a happy medium here.
250 transports suppressed easily.
There was a strat involving 2 PGs and 2 250HTs rush specifically for the suppression.
But then again, they had a fuel cost.
With current range, there is not a single reason about why kubel shouldn't cost fuel as well.