There is also remote control dolly called heliwagon ,
Yes, there is:
http://www.heliwagon.com/ A great source of entertainment at our local airport is to watch pilots for a gov. agency attempt to land on the Heliwagon on a gusty day. So far, they have never failed but great motivation for using an AviGround, Heliporter, or any of several other similar helo moving devices. This would be true of any raised dolly type device, not just a Heliwagon. BTW, looks like the Heliwagon sells for something in the $20,000 to $30,000 U.S. depending on size and options. I have had a close look at the Heliwagon and it appears to be a quality piece; however, put a skid in the wrong place and this wont matter much.