Did not really expect to be strengthening the trailer this winter [2 years old] but I found a vertical crack on the right hand "A" frame just in front of the beam supports. All the important sections are 75 x 50. Contributing factors could be... 1/Heavy sailbox which sits to the right, 2/Bumpy road from Normanville to home, 3/Double decking to Portarlington?? Probably not as it did not crack till 4 months later, anyway I have added forward struts to take away the "pivot point" and 4 of 600mm x75mm x 5mm steel plate equidistant under the front beam supports,so it should be strong enough now.Also built a lighter sailbox.