Just towing doesn't eliminate the need for a re-gen, nor does it guarantee a re-gen will be done. If it's happening a lot, maybe it has something to do with the way you keep stopping it? Usually this is triggered when the ECU think it's needed, based on sensors in the exhaust stream. The purpose is to burn soot off your DPF which reduce exhaust flow and rob you of power. I've never understood why people seem to set against letting them happen. They're a good thing.
You've posted zero information about your truck, age, model, any work you've had done, its running condition, the quality of fuel you put in it, what mods you may have made (you aren't a DEF-delete are you?), how up to date on your service you are, how often (and when was the last time) you change your fuel filters, whether you've had it into a dealer to look at this, and tons of other things like how you even know it's a re-gen. (My RAM very specifically calls out when it's doing one on the dashboard.) So I'm sorry but it's unlikely any of us can comment more specifically about whether yours should be doing this if that's what it even is.
That being said, if your truck does think it needs one, the very best thing you can do is to let it and the very worst is to interrupt it. A regen is done by injecting extra fuel into the exhaust stream to cause it to overheat so it can burn off that soot. If you interrupt it, what you're effectively doing is leaving that excess unburned and possibly clogging the DPF even more and making the problem worse.
