Well, you are fooling yourself a bit in thinking you can get a 210 with mid driver for much under what this one is and keep the quality of tone and volume. That is a reasonably large box with pretty heavy duty drivers (even though they are neo).
If the 7-8 pound weight differential is 'deal killer' issue, you might consider an LDS 12/6. Don makes a fabulous spec that is small, with rear ports, and a beautiful faital mid driver, with a Ral Patterson crossover. He also can use lighter wood (hard to come by but a while ago he said he has had better luck living in Seattle than when he was in Detroit). I would guess he could hit 38 pounds or so with that spec.
A single 12 with mid driver will give you a similar tone in a smaller box with a single woofer. My guess is, that will slice 5 pounds from the weight, and be a smaller, easy carry.
Of course, given your cab is reasonably lightweight, I would invest in a good small cart and be happy

Depending on its size (footprint) the Kart-a-bag Concourse III or the larger Super600 would work, and both has curb/stair walkers and bunjee tie downs.
I have a wonderful Arnopol Thunderchild TC115 that is 34 pounds and slams, but they are not available any more. I believe he could do a composite fEARFul 12/6 for, so that might be an option (and probably hit 32 pounds or so... not sure). A bit spendy though.