Welcome to the Disney Parks Moms Panel, Gabriel! A trip to Walt Disney World Resort with your little ones takes a little extra planning, right? There's naps, snacks, and tired little legs to think about, which is why it's a good idea to check out the
Park Rules and Regulations to make sure your stroller fits the size guidelines.
The rule at Walt Disney World Resort has always been that no wagons, regardless of whether they are pushed or pulled, are allowed inside the theme parks, and that does include the Keenz brand you're asking about. There has been some confusion about the inclusion of stroller wagons in that rule, so Disney recently updated the park rules to make it clear that they are not allowed.
This post from the Disney Parks Blog has all the information about the updates so you can be prepared when the strict enforcement of that rule goes into place on May 1, 2019. I saw that you mentioned that most popular stroller wagons fit within the new measurements of permitted strollers, which is 31″ (79cm) wide and 52″ (132cm) long, but they are still prohibited under the stroller wagon rule.
There's no need to worry though, because many strollers on the market, including many double jogging strollers, will fit within this new guideline! You are welcome to bring your own stroller, or you can
rent one (single and double!) at any of the theme parks or Disney Springs, or from a Disney Featured Provider.
I hope this answers your question, Gabriel, and let us know if there's anything else we can do to help you plan your magical vacation.
Jessica