Air bags are one of those things that aren't strictly necessary for towing, but make life much easier - particularly for heavier loads. A weight distribution hitch is another example of a "nice to have" that becomes more of a "must have" the heavier your load gets.
Probably something like this:
https://www.amazon.com/Tobbi-Portable-Large-Folding-Ladder/dp/B07N836P2H/ref=sr_1_7?keywords=folding+pet+ramp&qid=1582404951&sr=8-7
There's a video in one of the Amazon reviews:
https://www.amazon.com/Renegade-Winjet-CTSRNG-0646-SQTS-Gladiator-Sequential/dp/B07X6KQNFG#customerReviews
And it looks like Winjet updated their site, the description now includes the JT.