Historically speaking it would make sense to get rid of its spotting as it required operators to know when to detonate the explosive.
Stat wise, the 400dmg it does when detonated vs the 200 when killed by enemy unit coupled with the larger AOE than USF demo means its rather potent. The mobile camo it gets means that its hard to track down by light vehicles that can and will be killed if you get to close and its hard to judge this range resulting in a lost unit. I think making it have a very limited line of sight would allow for some good counter play as making it a support unit would make it require a unit to spot for it.
Just an added thought, if this logic is sound then make combat/assault engineers
