For my 2016 short bed Mega Cab 3500 I'm looking for an additional 30- 40 gallons. Aero Tank Enterprises in San Bernardino CA makes a 40 gallon replaced of the original tank and an 20 gallon aux tank. This lowers the spare tire 7 inches. Has anyone done business with Aero Tank? Will this void my extended warranty? Price seems reasonable approx $1,600 OTD.