i-beam catenary transportation system

huangyhg

i-beam catenary transportation system
i am currently undertaking a project with a firm who whish to produce a transportation system to go on the back of a semi trailer to transport a catenary cable systems.  
so far i have calculated that i would need four sets of supports along the length of the i-beam (ub200*100 13.5m long) possibly made from 50*50*5 shs.  the supplied i-beam  is to sit at least 2.8 metres high. there has to be a space in the frame at least 0.6m wide from bottom to top support to accomodate hanging cables but otherwise size is not restricted.  a secondary aim is to make the supporting frame modular so that it can be stored easily.   at the moment i am trying to determine an appropriate frame work to support this structure. the total mass is about 6 tonne and it can be no wider than 2.4m as the flat bed dimensions for the trailer are 13.7m by 2.4m.
if anyone has any suggestions or places that i can look at which could aid in the design, this would be greatly appreciated!
thanks
                   dave!