2023 GMC Yukon XL: 225.2 inches
The Yukon XL was the replacement for the Suburban nameplate in the year 2000. Although the Yukon XL is basically a Chevy Suburban model it offers a luxury upgrade over the standard offerings. In the Denali trim level, the Yukon XL is a full-sized monster with a whole lot of luxury (via Trusted Bulletin).
The Yukon XL has a powerful standard engine and its wheelbase length of 225.5 inches makes for one of the largest SUVs on the market. The Yukon is one of the most well-known nameplates in the GMC portfolio, and when it comes to a full-sized SUV offering nothing beats a luxury-ridden Denali model.