That fold trick doesn't work if you use vinyl coated bullet weights. Weight keepers are the solution then.
I would recommend getting metal weight keepers as the plastic ones can break due to sun fatigue or if you drop the belt the wrong way.
If you use the traditional 2 slot weights then the folding trick will work. A single weight keeper at the end (non buckle side) will ensure that no weights are lost if you're doing a weightbelt roll.
I've got a number of vinyl coated weights that are just like the traditional lead weights in shape, but they aren't two pounders... they are 5 to 10 pounders. Being a big guy with sufficient bioprene, it takes a lot of weight to keep me down!