I'm going to just tell you like it is. Forget that LIGHT-DUTY ELECTRIC PICKUP for towing. A 500 mile range towing? Not in your wildest dreams, maybe 150 miles. And why would you be planning a 500 mile day anyway? That's just crazy. Get yourself a capable ICE truck, at least a 3/4 ton, preferably diesel. Hitching and un-hitching is a simple matter of two chains and the coupler.
We just bought our granddaughter a Tesla for her sixteenth birthday. I drove it, first time I've ever been in an electric car. It's impressive, 0-60mph in under 3 seconds. My 1970 Corvette with a monster engine was about twice that. I have no idea how long it would take our Silverado 3500 diesel pulling the Oliver to get to 60mph. Probably about 30 seconds or so. I don't worry about it, and anyway the whole rig weighs nearly 18K pounds. EV's are fun for around town and will get better with time.
Just for fun, I went online and "built" one. Starting price is $92K. They are only available with a short bed (71 inches). Just be aware that a regular sized Clam enclosure will NOT fit in that bed unless it is placed diagonally (terrible for packing). I chose the Max Range Denali 4WD since I would be towing, Now I'm at $100.5K. I see that you CAN spend up to an extra $4k on exterior paint but I chose the no cost white. I hate that there is no other option on wheels/tires than 24". I would never be able to find a set of HD tires for it.
Anyway it totaled out at $100,845. But, if I buy it before the end of the month and pay cash, I'll get a $3K Purchase Allowance leaving be owing $97,845 not including tax, title, license and dealer fees.
I also spec'd out a very well equipped 1 ton Denali diesel with all the bells and whistles for comparison. It was "only" $88,270.