Lifestyle tips

It al really depends on where your seat is set at for some of it. I have a 19 optima and my belly still haves room. But I'm tall and my seat is all the way back and leaned back some for head room.

How about using a trailer? They are available in various sizes and load capacities
(ducking and running )

some of the older ford falcons, mid 00's volvos but their roof can be low on some models.

Look at Minivans. Perhaps a Toyota Sienna or Honda Odyssey.

Try a older 2014 or older Kia Sedona

I have a 2004 Nissan Xterra and at 425 lbs in was hard to get in and out of.
I had a 2009 Mustang as well and it had plenty of belly room but at that weight my hips rubbed the door and the console.
I have a Jeep Wrangler as a daily driver now and at 360 ish it has plenty of belly room and hip room.

There is a pic of me in my Xterra in my pics section.
I don't remember what my weight was but it was getting to be a tight fit.

I haven't fit in it for a while now.
I do start it up every week or two my neighbor drives it when he needs it to haul something for his wood shop.

My partner who's a feedee and a car salesman recommends looking into a Kia Sorrento. Other options include pickup trucks with a bench seat or a Mazda CX5. Basically you're gonna want a good ride height that'll be easy on your knees--you want to be sitting, not squatting. But if you really want a sedan, a Chrysler 300.

My wife has ranged from about 230-340 lbs over the years and refuses to have a car that is less than ideal from a comfort perspective. I can't blame her one bit. We both used to do a tremendous amount of driving and have had numerous vehicles over the years.

The following vehicles were comfortable: Saturn View, Kia Sorento, Hyundai Sonata, Hyundai Santa Fe, and Chevrolet Tahoe (most comfortable by far). All had an automatic transmission except the Saturn which was a 5-speed manual. (That Saturn did have a shockingly roomy driver's compartment!)

The Hyundai and Chevrolet products also have been extremely reliable and I highly recommend them.

One vehicle I owned that she absolutely hated was a Saab 9-3. It had a 5-speed manual transmission, requiring an up/down motion with the leg to work the clutch pedal. I must admit, she looked so hot squished into that Saab the one time she drove it, it was such a tight fit, and watching her jiggle as she worked the pedals drove me crazy!