Yes, following three charges will be added at end of your trip:
Excess Mileage Fees – If your 5 day rental trip had 500 free miles and you drive 1500 miles then you will need to pay for 1000 excess miles (1500-500). At $0/33 cents per excess mile this will cost you $330. (If your excess mile rate is higher then change this calculation).
Cleaning Fees – If you return the RV dirty, then you will have to pay cleaning fees that may range from $100 or higher.
RV Damage Charge – This the hidden ‘torpedo’ charge that can devastate your budget and whole rental RV experience. In some cases renters may be at fault e.g. they scrape the RV against a tree and scratches throughout the side of the RV, they will be liable for paying the $1500 deductible before insurance covers rest of the damage. There are many such scenarios that are discussed separately in more detail.