I had a similar problem at my house. Sharp ridge between flat pavement and steep driveway - just cut 3ft back either side and re-profile with new concrete; same below where steep driveway meets flat garage - cut off the stubs below the rear roller brackets as they hit the concrete garage floor before the trailer wheels levelled out; A frame was too high for doors - modified doors and garage roof, also shifted whole boat much further forwards on trailer to give rear wheels on car more traction and after a considerable amount of tinkering it all works a treat now. Persevereance is good. 1st time was scary, lots of slipping the clutch and pulling back and forth to get the angle right (only have 1/4" either side of rib to fit through the width of the doors, but now I reckon I can do it in 1 attempt, I've marked a line on the garage floor that the trailer tyre has to follow to get the alignment correct and I know as long as I can keep that tyre on the line in my drivers side mirror it will all go fine (except for the time I squashed the girlfriend, but that's a seperate story!)
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