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By smaller do you mean they physically take up less room, or a lower weight rating? Superglide has a 12K fifth wheel hitch that's made for ultra shortbeds like the F-150 Supercrew and Toyota Tundra.....but it's almost $1900. You can get a 20K roller/slider for half that, and a standard 16K for around $400.
Also...it only costs a couple of bucks to put your truck on the scale at your local truckstop. Get it weighed and you'll know exactly how much room you've got to play with when looking at fivers.