I've also been wondering about a naval analogy for convoys. In a perfect world each convoy would have an integral escort while there would be other combat assets roaming about to either hit the bad guys first or come to the rescue.
In terms of mitigation, small and big packets have advantages and disadvantages. Big convoys allow you to focus your available escort resources, as well as the other bits like ISTAR coverage and QRF. If they are military personnel in the escorted vehicles you also have more people to fight the battle if it happens. They are also more lucrative targets, I suppose, and can become unwiedly.
Smaller packets are more agile and perhaps less of a lucrative target. They also make it harder to provide escorts, ISTAR support and QRF coverage. I think that the bad guys are happy to get one truck, so if we feel that we need to have escorts then perhaps bigger is better in terms of packets.
I conducted one major escort task in Kabul, namely the provision of armoured vehicles to the United Nations Security Council when they visited Kabul for several days. Having one big convoy made it much easier for us to focus our available assets, although it was rather large.
As an aside, the Coyote is very well suited to these types of operations (as is the LAV III I imagine). We also practiced integrating TUAVs into one road move to trial some procedures. Helos would also be excellent for these types of tasks to try and ferret out ambushes etc.
Cheers,
2B
p.s. Looking at the two posts since I started, having AFVs lead the packet at least give you a chance against some IEDs (command detonated will still be a threat to the soft-skins). I agree wholeheartedly on having aviation. A good ISTAR plan (incorporating everything from infantry patrols to OPs to UAVs etc) could also potentially catch some attackers before they set their ambush/IED. Cities and countries are pretty big, however, and it is hard to cover everything.
We should try to have our people in convoys behind some armour to at least mitigate the effects of RPGs and IEDs. Not always possible.