I'm interested in buying an older jeep and building it up for off-roading. I'll be doing some sand running on the beach and general trail use. What year jeeps are the best for this type of project. Are there specific items I should look for when checking out jeeps? Are there any pitfalls to be aware of? I've had my share of 4x4 trucks, but this is my first venture into the world of jeeps. Thanks.