If you are going to tow, go with the 3500. I chose the NV with much the same rationale as you. We just took delivery of our 2018 NV3500 SL cargo a few days ago. I was thinking the 2500 would be good enough, but all the 3500s have the 7 speed transmission, 75 series tires (vs 70 series) class IV receiver, 7 pin connector, tow mirrors, are prewired for trailer brake controller, and have a transmission fluid cooler. There were no significant differences between the 2018 and 2019. We were fortunate to find the 2018 we wanted with the rear window option. Going with the 3500 just made it easier to get it all versus the 2500. Download the brochure and check out the specifications. The differences are listed. Check with your dealer for the complementary upfit package options for businesses. I've also ordered a Redarc Tow Pro Elite proportional trailer brake controller from eTrailer.com for clean installation behind the dash with only a control button visible on the dash. That's a job for next week.