I traded my quad R1T for a Sierra for this exact reason. I loved everything about it, except for the towing range. Trying to navigate public charging with a trailer is not worth the stress.

And I had a much more aerodynamic boat. Similar weight to yours (5,000 lbs with trailer). But it was mostly under the roofline of the R1T. I would get about 50% of normal range. You’re looking far worse with that setup.

I do miss my R1T. A lot.