There are none that do 2 ohms
AFAIK, but 4 and 8 are commonplace, and the wattage is no problem: one of Peavey's DPC models is rated for 1500W.
The problem with 1RU power amps is they tend to be extra long (deep) front-to-back, and they sometimes need an empty rack space above them for cooling. So you end up with an extra-deep 3RU rack, and no savings of weight or bulk after all.
You're better off getting a "micro" amp head, and a Tech21 VT Bass pedal if you want SVT tone in a small-but-powerful package.