Such a vehicle already exists -> The BMW i3 Range Extender (REX), the notable ones from 2019, 2020, and 2021 have batteries that can go over 100 miles and they have an onboard gasoline generator to charge the battery when it gets close to depleting. It's not really an SUV though, has two suicide doors and room for only four, but it's pretty close to the 100+ mile plug-in hybrid. That car is no longer made, and a big reminder that longer range PHV's aren't as desirable as many might think.
I think that when given the opportunity to get more range from a PHV, then the desire is to simply remove the engine (and its complexities) completely and pack in more batteries for more electric range, and end up with a full EV.