Anyone have an idea of an appropriate rack for Dell Precision gear? I have an R7910 and a couple of C4130s and all the racks I can find don't have enough depth to fit them.
Do you need to have a door on the back of the rack? Bramhall's Marshmallow Theorem* predicted this problem over 35 years ago. When I run into this, I use rack offsets from Newton Instrument (we call 'em "knuckles") to extend the rear set of rails further back:
Newton catalog C.10
here - look on page 164 and following. You can extend by 3", 5", 7" or 8". Note that my pictures above are of a 23" rack, so in addition to the knuckles there are 23"-to-19" reducers.
You could also just decide to use a fixed mounting (no rails) - especially handy if you don't have rails for your chassis. Just mount the rack ears directly to the front of the chassis and support the rear on a horizontal bar (see page 168 of the Newton catalog linked above):
* The Marshmallow Theorem states that the volume of a marshmallow remains constant no matter what shape you force it into. When 1RU servers became a "thing", manufacturers started stretching the front-to-back distance to hold all of the stuff that used to fit in 2RU. IBM was one of the early leaders in this area, creating a 1RU server that was 45" deep and needed at least a 48" deep cabinet for mounting to allow for front and (mainly) rear clearances.
Extra points if you've ever heard of the Marshmallow Theorem and know where / who it came from.