Mobile access unit and cage

A mobile access unit comprising:

• a base portion having first and second apertures;
• a plurality of wheels connected to said base portion to allow said base portion to be moved toward and away from a selected location;
• a ladder adapter arrangement having a first pair of ladder adapters and a second pair of ladder adapters, said first and second pairs of ladder adapters configured to be inserted and secured into said first and second apertures, the first pair of ladder adapters having at least one adapter step extending therebetween to support a user, the first pair of ladder adapters having a first height configured to extend to a first location above a surface of said base portion, the second pair of ladder adapters having a second height configured to extend to a second location above said surface of said base portion, said first height being greater than said second height, wherein said ladder adapter arrangement is configured to allow a user to alternate between securing said first pair of ladder adapters and said second pairs of ladder adapters into the apertures;
• and
• a ladder assembly having a first pair of uprights directly connected by ladder steps, the ladder assembly connected to said base portion by way of resting on top of a selected one of said pairs of ladder adapters, the ladder assembly configured to extend to multiple heights as a direct result of switching between the first and second pairs of ladder adapters.