For your commercial kitchen, you need a fryer with plenty of room, and the Pitco - SG14S - Solstice Standard 50 lb Gas Fryer holds up to a 50-pound capacity and fries up to 88 pounds of fries every hour. The SG14S has a millivolt thermostat, heavy duty door hinge, stainless steel heat baffles, lowered flue temperature, and a 14 by 14-inch frying area, along with two nickel plated baskets. With 110,000 BTUs, the Pitco Solstice Standard 50 lb Gas Fryer (SG14S) is CSA and NSF certified.
The tank on the Pitco - SG14S is stainless steel. This unit has a 1 year warranty but for specific warranty info you will need to contact Pitco directly.
These casters will fit both of those units... https://www.etundra.com/restaurant-parts/hardware/equipment-casters/sets/pitco-fryer-caster-kit/