I had a 1974 710 Pinzy for about 8 years. That thing would go anywhere I pointed it. It is not cheap to get parts for and you need to make sure it has had all the axle/drive train upgrades before you get into one. I sold mine for what I paid for it and it is now somewhere near Buffalo Wyoming. My biggest complaint was the max speed flat out on a highway was about 55 mph. Put a hill in front of it and that drops down to about 45 mph max, foot to the floor. And since it has straight cut gears in the drive train and tranny, at top speed you need hearing protection from the noise. I even put sound deadener in mine but it was still very noisy. Remember that the Pinzguaer was designed to operate in the forests in Europe so it really is limited on US Highways, but in the off road arena, it shines. I know there are some diesels coming into the states but not sure how they are getting them past customs since they are not DOT/EPA legal. Most of the gas engined Pinzies are classified as "Novelty Vehicles" due primarily to their age.
Make sure you go through a reputable dealer. Swiss Army Vehicles would fit that bill. There are plenty if you do a search, and have someone who knows those vehicles look it over for you. Due to their age and storage conditions, many are real rust buckets. Good luck. In their design realm, they are a hoot to operate.