That deferred repair work is another reason to not lease a new vehicle. You clearly aren’t meticulous about following the maintenance schedule for your current car (for whatever reason). If you do the same with a new, leased vehicle you’ll find you’ve violated the terms of your lease. Leases only work halfway well for people who treat their vehicles well and know how much they are going to drive. Returning the car with excess mileage and in poor condition gets very expensive. It’s how these companies make most of their money. They’re betting you won’t be able to comply precisely with the terms of your lease.
Anyhow, this is just not a decision you should be making at this time. The next few years are going to be very expensive for you and taking on another big expense is a bad idea, especially since you admit that most of the time you won’t be driving. If you’re not putting on a lot of miles your Toyota could last for quite a few more years.
All this depends partly on what all this deferred maintenance consists of. If the parts due for replacement aren’t that badly worn, you may have just saved a few bucks by putting them off, but it’s a bad habit to get into. If they’ve made the car hard to control or stop or interfered with safety features, you’re a lucky fool. Get the safety issues fixed immediately before you hurt someone. Relatively inexpensive maintenance/minor repairs that can lead to very expensive repairs if not fixed should also be a high priority if you’re keeping the car. Maintenance/repairs that will be a bother if they make your SUV unavailable or uncomfortable, but won’t cause serious damage, can be deferred (potentially - you have to evaluate likelihood.) This might include audio systems, air conditioning, and many kinds of rattles and squeaks.