It was both new tires and rims, we upgraded to the biggest size possible without rubbing. Tires were Falken WildPeak A/T3W in a 245/65R17; 17 inch rims (Vision Cross, but they're all pretty similar). Not sure what the offset on the rims was, but https://www.siennachat.com/ is a good resource if you decide to go with Toyota.

Bought an AWD Sienna last winter and put bigger rims and beefy tires on it - it now has better clearance than a Range Rover (only using that comparison because we were parked next to one right after we did the tire switch). We were going to do a lift kit but ultimately didn't bother, we never bottomed out on the mud season ruts last year. Definitely recommend.

https://legislature.vermont.gov/Documents/2024/Docs/BILLS/H-0098/H-0098%20As%20Introduced.pdf

​

https://legislature.vermont.gov/Documents/2024/Docs/BILLS/S-0031/S-0031%20As%20Introduced.pdf