You may purchase adapters that fit your present ladder from most any large RV accessories store. I looked at a rack to carry 2 bicycles on my ladder, evaluated the bouncing weight involved, then looked at the 8 wood screws that hold the ladder to the rear cap and decided against hanging anything from the ladder while driving.
IMO- Lawn chairs are much less weight, and may be carried on the ladder without loosening the ladder mounting screws.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"