dont do level spacers. Do an adjustable strut or coil over. As @Quick_Shifter said if you lift/level your RAM correctly it wont hurt anything. Since its a lease I assume you do not plan to off road the truck. You got a couple options. On a lower cost option you can do Eibach struts and I recommend their coils as well. If you want an even more push ride than that you can can go with Fox 2.0 coil overs.
message me if interested and I can give you some quality options and we can discuss pricing.
message me if interested and I can give you some quality options and we can discuss pricing.