Patsy,
Sorry to hear the rack is leaking....was afraid of that when you said the fluid was very low.
Yes, you can get a 2nd opinion....check to see if there are any local Freightliner (same as Dodge...all built by Mercedes in the same factory)
Commercial truck repair shops in your area.
You may be able to save quite a bit and they may use a remanufactured or aftermarket steering rack, saving you even more $$.
I would call the dealer that worked on your MH and have them get it running right again.
Seems pretty obvious that they didn't get something hooked back up as it was before they did the oil change and evaluated the steering
rack leak.
Also check if there are any independent Sprinter repair shops in your area.
They may be able to save you some $$ changing out the steering rack.
Was this a Dodge dealer that did the work?
Might also check for a Mercedes Benz authorized Sprinter dealer close by and ask them for an estimate on changing out the steering rack.
I did a quick online check, and it seems there are some independent Sprinter Repair shops in the Detroit/Dearborn area.
Hoekstra Freightliner has been mentioned here as a good place to have a Sprinter repaired....might check with them.
https://sprinter-source.com/forums/showthread.php?t=9564
Hope this helps,
Roger