@curly_kate , cracking can be a serious problem in my tomato patch. Overhead sprinklers and a quickly draining soil set things up for culled tomatoes. Culled from the market, anyway.
Mulching should help but then I'm facing a few other problems. Voles like to get under a nice mulch and, that terrible tomato pest, the slug likes to hang out there, also!
Generally, I avoid beefsteaks with that traditional oblate tomato shape. They hold water and often crack.
I'm not sure if people think that my tomatoes are heirlooms, or not. Having a display with a number of colors may distract them sufficiently

. Only the non-red varieties are heirlooms. Nearly all of the red ones are hybrids.
There are 2 exceptions. I have continued to grow out an accidental cross of Kellogg's Breakfast. It's earlier and an
orangy red. The other is Thessaloniki. There is not much to distinguish that heirloom from a modern red variety. In fact, it was brought to the US for commercial farming.
There is a possibility. Old-time commercial varieties may be a good choice for you. I haven't felt the need to explore that too far. You may have to put up signs identifying them as heirlooms. That's okay. Part of your job is to educate the consumer; not just to distract them

.
Steve
edited to add those last few words