our previous unit did not have a ladder (only one on the lot without one) and it sucked. I will never buy another trailer without one. we tried to have the dealer install one as part of the purchase but it was way too much money.
so while camping I could not access the roof and while parked at home always had to drag the ladder out and be careful on climbing up onto the roof.
our new one has a ladder
and it is so nice to be able to easily access the roof once again. try to have the dealer install one as part of the deal.