There's a simpler way to get a 2 inch lift for your 2019 Crossroads Volante with the Correct Track tandem lift kit part # RR23QX which does not require you to replace your current springs. This will give you a lift of 2-1/8 inches.
If you want new leaf springs you'd need to know the axle capacity of your trailer and the current length of the axles. view full answer...