There are a number of RV brands that have been known to produce subpar products. These brands should be avoided if you're looking for a quality RV. Some of the brands to avoid include: Coleman: Coleman RVs have been known to have a number of issues, including leaks, mold, and poor craftsmanship. Jayco: Jayco RVs have also been known to have a number of issues, including leaks, poor craftsmanship, and problems with the electrical system. Winnebago: Winnebago RVs have been known to have a number of issues, including leaks, poor craftsmanship, and problems with the plumbing.