Crunching numbers for potential new TOAD

I'm familiar with Jeeps. I have an 87 that I've restored, but it's a Sunday driver and probably the least comfortable vehicle I've ever owned. The older ones really feel more purpose built. Of course it's lifted and has bigger tires. Plenty of room for me but the cockpit is a bit tight. But man is it fun with the top and doors off. We live at the beach and it's perfect. The newer ones are much better from a ride and comfort perspective. I have found though that the newer ones with the larger dash feel a bit more claustrophobic but ergonomics are fine. It's still the best toad for us. I am thinking that from a drag coefficient, I really can't see where the marginal weight of the vehicle really matters much when flat towing. Pulling a 4 down toad doesn't impact MPG much which tells me it's not much of a drag. It's not an F350, it's a 2 door Jeep coming in a 4k lbs. I can't really see where being close to the rating is going to matter. On a few other forums, lots of guys tow Jeeps with MSB based C's and have no issues. The new Mercedes 6 cyl is a bit anemic at the top end and on hills, but that's the nature of that set up.