Trying to move abnormal loads by road yourself can be very problematic. No matter whether as a one off or as part of a much larger operation, it is likely that, to abide by current legislation and to ensure that your load reaches its destination in one piece, you will have to use specialist transportation.
Buying such specialist transport and ensuring that you have the right type of escort vehicle is likely to be extremely expensive indeed and ensuring that you have drivers skilled in the operation of both vehicles is also not going to be easy. As such, unless such services will be needed day in and day out, it will almost always be preferable to outsource such transportation to outside companies.
In turn, even if, in the long run, the costs of such transport outweigh the costs of buying your own vehicles, there will be many problems you will avoid and from taking on new members of staff and ensuring that you are well versed in the safety aspects of transporting abnormal loads, the time and effort that is saved will often more than amply cover any disparity in cost, whilst making your life a great deal easier at the very same time.
Furthermore, the actual transport of any load will need a great deal of in depth planning, so even when the actual physical cost of utilising abnormal load services turns out to be slightly greater than doing it yourself, the logistical nightmares that can accompany such transport will be left up to those with a great deal more experience in such matters.