If you are looking for a tire good in rain and light snow get the Triple Tread. The only downside is that they don't have great traction on dirt. This isn't an issue on my Sequoia or my past Tundra, but may be a concern on your Grand.
If you're looking for an "off road" type of tire, look at the BFG All Terrain or the new Goodyear Duratrac. The BFG is an excellent product and the duratrac looks like a winner.
I've sold several sets. All happy customers. Rather hard to get them to lay out rather pricy initial cost, but they seem tough, long lifed, excelent wet, decent snow, poor mud (pretty obvious just looking at them) tires.