Hi Jack,
Yes, I see in Newt the 2" travel drawtube does vignett the 75% ray.
I have a few years experience of regularly transporting a 16" dob to dark sites in a variety of vehicles. At the end of the day I decided the 16" mirror box was just too heavy for me to consistently lift into and out of the back of my vehicle with minimal risk to my back. I went for a van, wheels and a loading ramp. I reckon the minimum weight you could get a classic design 16" mirror box for would be around 20kg - the mirror will be about 12 kg. It might be worthwhile considering the dimensions of the mirror box and lifting it into and out of a car boot with regard to your specific circumstances.
Cheers
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