Do not go down the east coast on 185 from the border to Yucatan. Most of our friends from eastern US and Canada go down this way and have not had problems but others have. We know one couple that asked a number of folks how best to go down to Belize with their pickup (they have a home near Corazal) and everyone told them not to go that way. They did and were hijacked by three guys with submachine guns (the guy is an ex-Marine from RVN days and noted they were H&Ks). They lucked out. A friend was shipping equipment from Belize to US and they paid him to truck their packup back to USA. Hundreds of tourists go down `185 from Brownsville without problem but we would advise against doing it.
Reed and Elaine