An interesting article in the September "Streaming Media" magazine highlights a carry-on suitcase size kit for producing a multi-camera live streaming video. With products from Blackmagic Design, Teradek, and a few others, the kit does appear to fit in the overhead bin, and will put you out about $9,000, certainly not too bad for a pro-quality result.
Of course, captioning needs are not included, and admittedly an HD491 encoder is not going to fit in the extra space in that suitcase! Also, the interconnect for the system is based on HDMI, which cannot carry production closed captions at all.
Since a very large number of live corporate or municipal events really do require captioning for ADA compliance or language translation, how does that fit in? Check out EEG's new Falcon cloud service if you haven't seen it yet.
Falcon is a virtualized caption encoder living in our cloud, that communicates with transcribers over iCap just like a hardware CC encoder. The transcription data is processed into an low-delay captioning stream in several formats, and then sent along directly to your video server or CDN provider. You can rent a Falcon instance without needing to install or carry anything - you just need to know the account details for your streaming server, and the company name of your caption service provider.
Here's the full Streaming Media article, with space for cloud captioning only: