The only non standard way i use cargo hulls are early game surveys

put 3 impulse drives survey mod nad basic support and you will never have to worry about running out of cash early thanx to anomalies. I always rush sensor tech and impulse drive or warp drive. On large galaxies 3 cargo surveys is enough
I dont really see the point of using them as one shot weapons becouse most of the time when Ai declares war at me i already got techs to build a 5-7 attack 10 speed medium hulled ships. As for the sensor i dont think its necesarry. Eyes of the universe wonder is very cheap ( 5500?) and sensor tech tree is also cheap so its not a problem.