I put a diamond back on my 21 Ranger, added and 8" deep crossbin. Kind of best of both worlds. They make a 12" deep as well.
Pricey for sure, durable and would take a crow bar to get in. Pretty water tight also. I got the base model, SE I think.
I will say its all or nothing with the DB, being 2 "lids" your left with a cross bar. Removing the whole thing is easier after the initial set up and install. Might not be so bad on a 6.5 to 8 foot bed.
A small bed like mine, that cross bar makes it hard to haul much, being it is such a small bed anyway.
