hello all,i'm currently presented with a hard decision. i have a 2019 ram 2500 with the 6.4 gas engine that i'm hauling a toyhauler that when loaded will weigh probably close to 12k pounds.my ram is able to to around 12,600 pounds so i'm ok on weight.it pulls ok but struggles some on bigger hills and of course has the high rpm rev when climbing those hills,i average about 6mpg when towing and 14 when not.the a/c is very poor on the ram and the ride is very jarring.i can lease a 2020 silverado 2500hd with the duramax and 10 speed for $700 a month with some of that payment as negative equity on the ram.i know the silverado would have no issue pulling that camper but is it really worth it? would you keep the gas ram or upgrade?