There are free camping sites located all across the US, the tricky part is finding them. If you are headed to Hope Valley, then first things first, make sure you stop by a ranger station to pick up your campfire permit. The entrance is located right where highway 88 and 89 meet.
Just 30 minutes from Lake Tahoe or Carson City when you're driving into Hope Valley, you are looking for a paved road that goes over a cattle grate and turns into a dirt road. It's always wise to scope out your spot before you bring up your RV. You are going to see an information board notice that says the stay limit is 14 days.
The roads are bumpy and dusty so you're going to want an RV wash after you leave here. There are plenty of things you could do at this ‘free campsite’ (also known as ‘darmowe kempingi’ in Polish), it is great for hiking, it offers beautiful views of the valley. So make sure you bring your gear.
There are rivers that are close by where you could do a great fishing, kayaking or if you're really brave, swimming! If you have pets, make sure you keep a close eye on them because you are out in the middle of the wilderness.