There are three different rate scenarios to consider: Overnights, Longer Term, and Freebie/Cheapy.
Overnight stays are generally at full price or a slight discount, so pricey. You can save some money using 30A service instead of 50A, and using dump station rather than onsite sewer, and you can choose lower-priced parks and public parks where available. Discount programs like Good Sam and Passport America will help IF they have member parks along your route. With campground prices skyrocketing in last few years, we found that we were spending about $40/night for a 50A full hook-up. A lesser site was only about $4/night cheaper, so we mostly paid for the convenience of 50A FHU.
Longer term stays can often get you weekly, monthly or seasonal discounts, but perhaps not in popular destination area. If the park is always full anyway, they have no reason to offer a long term discount rate. But for long term stays, we always wanted 50A FHU, so no opportunity for cheaper sites. We averaged about $30/night for long term stays at monthly rates.
Freebie/Cheapy stays run the gamut from friend's driveways to Walmart parking lots to primitive or unimproved camping areas on public lands. They are mostly free or a few dollar/night, but no services. If staying with friends, figure on helping with the electric bill (you may be adding $1-$3 per day to their power bill), buying them dinner, etc. as part of the budget. Also the cost of increased genset usage. We always figured that "free' was really more like $5/day. To help find & choose freebie sites, subscribe to free camping info such as https://www.overnightrvparking.com/
Here are more tips on cheap stays: https://rv-roadtrips.thefuntimesguide.com/rv_parking-2/