That's what I do.
Craig's, Facebook, Goodwill and garage sales are all excellent sources of pro built cabinetry that you don't have to build yourself or can't build. Reduce recycle and reuse. In my area, a dresser or hutch can be had from free to $50. With careful selection, research, can come across something that will fit your budget, decor and interior. Can always paint or refinish.
Cut or drill to fit and install.
I managed to get a free hutch and solid wood table. Goodwill supplied a hutch and cabinet for less than $25 each and some chairs that I will reupholster for $5 each. Also picked up a showpiece bureau of solid wood for $40. All in keeping with my vintage gypsy vardo theme. Pics to come...
There is a plethora of old style tv hutches and entertainment centers for sale which are unwanted as today's new big screen tv's don't fit in them rendering them mostly useless on the market today. But for our purposes, can work perfectly for storage.

The hutch I picked up had a solid pine front but everything else was heavy MDF. Too heavy and detrimental to a lightweight camper build. Find a lighter model or improvise?
I decided to enroll it into weightwatchers for a serious reduction.
I cutout sections of mdf, but how much is not too much? Going back to my IKEA days and assembling their furniture, mdf cross beams were 3-4 inches wide so I figured that must be safe.
Side panels were opened up leaving a 3 inch frame. Removed inner shelves and cut out the top and bottom ornamental extensions and voila! Figured about a 50% weight reduction. All I really wanted was the pine face with the other sides being hidden and just screwed into existing walls.
Problem of heavy weight at the tail end solved.
Cutting off the front and attaching it to a lighter 2x2 frame would also work for even further weight reduction if so desired.