I used to be in the same boat with bringing my laptop to and from everyday. Then I just asked for a desktop to be my main work machine and keep the laptop at home for out of hours and bringing with me on the weekends.
The job had no problem with it but then again they know with that setup I can access the network within minutes saving them alot of potential outages.
You just need to present your business case. If you can prove the value they'd be mad not to invest in it.
This was one of the options I suggested and would be my preferred fix. Its just getting a little frustrating waiting on management decisions while still lugging the heavy machine around with me.
Yes, there are alot of shiny macs and Ipads in use by higher management.
