If you're pushing the weight limit on your steps, consider getting two adjustable supports like these sold by Amazon & others. We have a 3 step Camco and it's solid as a rock with two supports underneath.
Cedar Creek Silverback
Mazda Miata TOAD for sex appeal
We switched out our 4 step flexco steps for a 4 step automatic steps hubby found online from dvr. We love them. Only replaced the front steps not the rear. This is on our 2016 Cardinal. Wasn't an easy job but glad we did it.