A short wheelbase means quicker reactions, less stability, and a worse ride. A long wheelbase means slower reactions, more stability, and a better ride. The Miata wheelbase is about 90", and I'd say it has good handling. The same applies to front and rear track.
Overall length is generally not a problem with cars in America. My truck is 237" long. That's a lot to deal with. My old 5 series, at 191" was not a problem. Our 500e was 142". That was a cinch to drive around. In my experience, width makes a much bigger difference in ease of driving. With a 500e, a canyon road feels wide. You can move around a lot within in your lane. A 550i on the same road is fun but you're just driving the road. A Model X or a truck requires paying attention to just stay on your own side of the road. At 75" wide, the I-Pace isn't a playful car, but it's not a problem on American roads.
The other day, I loaded 20' lengths of pipe in the back of the truck, using an extension off the hitch and some rope and tape to keep it all secure. I drove the freeway and the canyon, the overall length at 400"+, with a wheelbase of 149". That pipe behind the truck swung WIDE. I did the calculation. 19.5' is my legal limit. I hope the extra 6" isn't too much for the CHP.