Something is wrong with the lowboy trailer – Construction Simulator 2 Review

I now own 2 compactors and a tracked escavator and I cant get any of them to load onto my blue transport trailer.!! This is really annoying because I have to pay to have them transported to the construction site even though I own a transport truck and trailer. Please help!! What am I doing wrong?? Otherwise great game
Review by Hcsvirginja on Construction Simulator 2.