I have recently been playing around with the QB generator and noticed that in any engagement type both attacker and defender are able to purchase TRP's and deploy them anywhere on the map.
This to me seems illogical and open to exploitation, especially as they are very cheap and it is easy for either side to cover the main areas of a map with them allowing quick response, no warning (no spotting rounds) accurate artillery fire without a spotter needing LOS.
Surely only the defender in attack and assault battles should have access to TRP's.