RVs lose about 20% of their value in the first year of ownership. Some experts even say that initial 20% depreciation occurs as soon as the RV is driven off the lot.
RV models that are in high demand will hold their value better than other RV brands. For example, Airstream travel trailers tend to have better re-sale value.
Of course, current economic and market factors also impact the value of used RVs. For example, the post-pandemic demand for RVs has driven up the price of RVs.