FR Rockwood Ultra Lite vs Keystone Passport quality

We have,new to us, a 2011 Rockwood 8293RKSS with the outside kitchen. We love it. Except as a Ultralite they go scimpy to save weight. A prime example is the bathroom coat closet. I put a pack with my flywheels & a jug of OJ on the bottom of the closet & the floor broke. 1/8" veneer with a 1" x 1 " supporting it on one side with only 2 screws & no uprights. I've now replaced it with plywood & 1 x 2 uprights glued & screwed. No sour grapes, but they say light for a reason.