I use an aluminium tube, 5 feet by 2 inches, which I clamp in the dolly wheel bracket after removing the dolly wheel. By using the 5 feet aspect, it is possible for the dish to see over the caravan if the satellite is behind it. The length of the tube is governed by where you want to transport it - mine can be wangled into the front storage box.
If there is a sharp intake of breath from anyone about removing the support provided by the dolly wheel when parked, I have seen one instance of supplementary support being provided by using a scissor jack before removing the dolly wheel, but I must say that in 16 years of merely removing the dolly wheel there have been no detrimental effects at all.
Regards
Les.