As you use the term "Lads", it might be worth pointing out that almost always any drivers under the age of 25 years will face daily 'Young driver fees' on top of the rental cost which could put a big hole in the budget. With 35 days you have plenty of time to 'cruise' around and if you wanted to avoid 'One way drop off fees for your rental and see more of the country, you would have time to do a loop trip back to where you started from.

Just dig around the forums using the search function and check out the planning links in the tool bars above with a good map of the US at hand and you will find a wealth of ideas and info that will help with your planning.