To go with diesel or stay with gas…

I was looking at ordering a 2022 Silverado 1500. The wait is looking to be 3-4 months. Anyway I found a 2018 2500 hd with everything I’d like to have in a truck. I’ve never owned a diesel truck before and some things I read said that if you don’t tow heavy you can ruin the engine? I tow 5 days out of the week for lawn care but the mower only weighs 1200 lbs plus whatever the trailer weighs (not much). I don’t have a boat but there could be one in the future. Also how much in maintenance could I expect to spend a year on a diesel? Right now I basically just change my oil for my gasser and that’s it. Should I wait and get the 1500 or just go with the HD?