The roads here in South America are pretty good, but DO NOT break down, especially in Peru. I have lots of help from friends here in Lima but have still waited two weeks on getting parts through customs. And it looks as if I'll need to pay 100% tax, (350GBP/$700US) maybe more for 'storage'. There are several ways around the Darien Gap. One is flying but another is to take a yacht from Colon in Panama, to Cartagena in Colombia. I'm hoping to do this in reverse. It takes 6 days on average, but one day is spent snorkelling off a Caribean island. You can fly from the US to just about any South American capital. See the Unlimited Horizons website for more details on this.