Trailer ramp air lift assist home made

Home made trailer ramp airbag lift assist. Standard 2600lb air lift air bags. 1 x2 3, 16 tube for all the bracing and the 4ft long bar. The rest is 1, 4 plate. Air lines air 3, 8 These ramps are very heavy and weigh roughly 400lbs or so. The trailer is a 40, 000lb tag trailer for heavy equipment hauling. System operates on about 120psi