All decent power amps handle the bass end.
CA6 is a very nice amp, all 44 pounds of it.
The ProLite are not as sturdy built, nor do they weigh as much as CA6 or PLX.
The PLX at 21 pounds is very well built and big heat sinks. ProLite has these
Road Ready, and other true ATA cases I have not seen in 3 rack space sizes.
CA6 + SVP-Pro (53 pounds) + 25 pounds for RoadReady 4RU rack = 88 pounds total. Been there, done that.
I don't think an SKB plastic rack will tolerate that much weight.
I keep each PLX in a 4RU RoadReady case. 21 + 25 = 46 pounds.
The rear of the amp is secured to the rear rack rails.
Most of these have a 1RU Rane crossover, and the 4th slot is empty with a blockoff plate.
My preamp pair (RPB + VTRM) are in a separate 2RU ATA case.
Two racks, but less weight than a single rack.
I encourage you to think long and hard before buying a lead sled.
They are great amps (owned several), but the weight is too much.