We have 5 of us in our trailer and we find the storage is adequate. My wife and I use the overhead cubbies in the slideout for anything that can be folded (underwear, shorts, socks, etc). We also have 2 under bed bins that my wife bought. They are about 40" long, 20" wide and 8" high. They slide under the bottom bunk when it is folded down. We put the kids clothes in those since they are little. When we travel, we either throw those bins on the top bunk or slide them under the dinette before we slide in the slideout.
2010 Jayco JayFeather 213 EXP
2016 Ford F-150, 4x4, 3.5L ECOBOOST, MaxTow, Supercrew, 6.5FT, 3.55 axle