get a piece of solid timber, that will fit behind, rope this to a tree/solid obect so it pulls straight..
get someone COMPETANT (most SWMBO will not be!) :twisted: to watch carefully, as it will spring back a bit once load is removed..
position you vehicle carefully to consider where the "pivot" in the pull will be, ie, where the tubees are bent.. probably at the abar part.
good luck!