The only vehicles that uses softer springs for offroading that I am aware of are the Power Wagon and the Raptor. Every other 'off road package' is usually just different shocks and throwing some skidplates on, maybe tow hooks if they aren't standard. Even the Super Duty Tremor doesn't use softer springs, it just gets a 2" lift and 35" tires.
Your '18 2WD truck would have had a much higher payload and tow rating than any 4WD 1500 you can price out, I would guess. Mostly because it was 2WD and thus did not have the hundreds of extra pounds in a front axle, driveshaft, and transfer case, along with all the electronics to monitor and control said system.
Also note in the chart posted above, those are the MAX towing figures when properly equipped (no options, 3.92 gears, usually 2WD, etc.). Your average 1500 with a 5.7 and 4WD is likely going to have something like 3.55 gears, and if you option it up nicely your tow rating is likely going to be less than 10k, possibly closer to 8k. The real killer is going to be your payload and GAWR - more options (including 4WD and the skidplates in the 'off road package') are going to subtract from your payload, thus restricting the tongue weight of your trailer - presuming this is a camper you're looking at, a lower tongue weight typically means a smaller camper.
All that said, can you run over your payload and tow rating and get to your destination? Probably, many people seem to be doing just that. Is it safe? I would argue no, but then any time you step out onto the road you're taking a risk. It is all about mitigating that risk.