Though digital photo equipment has come a long way, I am using some of the finest and heaviest 35 mm equipment, as well as 2 1/4" x 2 3/4", and 4" x 5" film based cameras.
Though my work is sold through stock, most of my work is sold at Art and Art and Craft shows. With the film based cameras, I (and my printer) prepare digital files in the raw form for 3 colors that are on the order of 225 to 300mb or larger. This allows us to prepare photos on the order of 40" x 50" or for panoramic images of 4' x 8'.
I frequently sell photos that are 20" x 30" from 35mm cameras and 24" x 30" from my 4" x 5" cameras.
Digital as I have said has come a long way. But there is no replacing the large transparency (or negative) or very large digital file. In order to get this kind of image size if it is even possible, one needs to spend about $10,000 or more for a medium format camera plus the cost of the rest of the optics. Unless mistaken, to do this in large format (4" x 5") you need a digital back (about $30,000) and a laptop computer (not field practical or condusive to backpacking).
There is not only the cost, but the size, weight, capture time, and the usage of batteries (including weight and size). These are not lightweight or practical options at this point. For studio applications yes. But I know no Professional Photographer using this kind of equipment in the field for work similar to mine.
Check my website if you have questions of what I am producing. By the way since you live in CT you would have the chance to see the work at one of the shows that I participate in including Mystic (check my schedule).