a fun upgrade for rts legnds prime,a trailer.but the catch is it is actually motorized with a pull back and go motor gutted from a g1 twintwist.the trailer started as a matchbox single axle trailer. a square hole was measured and cut out from the front bottom to clip snuggly over rts prime's raise "shin" details.he doesn't turn independently of the trailer but as a bonus,when you pull him back and let go he goes pretty straight and far.(as far as the little 28 year old motor will take it) styrene was used to build it all up to simulate the bottom chunk on the original g1 prime's trailer,with the exception of the motorized rubber wheels being slightly taller than the plastic set right behind them.this was done to make the rubber wheels contact the floor more for better grip. a new energon axe hand was made from a small undersized k/o copy of the axe hand that comes with takara bookshelf g1 prime.the axe was cut down,refused together,then the mount section was melted with a torch and then squshed on and around his right hand.once it cooled,it now literally clips around his fingers and plugs into his hand. prime himself only recieved some much needed paint additions including his lower bot mode ribs(red),running/head/tail lights,wheels hubs,windows,etc. this is the square hole that now clips over his shins and toes in alt mode. his trailer doesn't fold open or do anything else but propel him,but it can store his new axe upgrade.