If you line up the two trailers should be easy to move. Years ago when SSS dropped off my RB20 I asked if they wanted my old L24. The guy said yeah, help we lift it into the ute. I thought he was joking but we took an end each and lifted it in. It was crazy heavy, but we did it. I'm in no way recommending that though.
If you have a floor trolley/creeper they are great for jobs like engine blocks. There low down so easy to drag heavy stuff onto.
But also think rocking it along some timber would be easy enough.