like for equipment such as back hoes bobcats or the like the upper and or lower platforms may include additional retainers such as trough shaped retainer 34 for larger components the shape and size of these retainers will of course vary depending on the particular implement to be retained larger components or implements such as buckets can be stored both on the lower and upper platforms for transport the upper platform as illustrated in fig2 shows mounting of two such buckets indicated by dotted lines 40 while the lower platform mounts a further bucket 42 to position and retain the buckets in place during transport particularly where the same implements are being transported by the same transportation unit either fixed or movable stops or holders can be employed one version of these can be seen from fig1 and 2 where fixed plates 44 can be secured by welding or the like to the frame members these plates 44 not only retain the buckets but also position them on the upper and or lower platform such stops or holders can also be adjustable as shown in fig7 and 8 various types of brackets 50 can be employed which can be positioned at different locations on the platform removable pins 52 can be inserted through apertures in the brackets and into holes 54 of the various frame members to provide adjustment referring to fig2 it will be seen that the mobile unit of the present invention can be mounted on a trailer 58 the trailer can be a suitable flatbed trailer having a planar base 60 with wheels 62 once loaded.