That's the issue.
I'm definitely not 6ft.tall lol, I tend to be vertically challenged at 5'5" and I can see that being a bit of a challenge for me. Not all that flexible anymore either so stretching the leg to heave on up there isn't going to work too well either.
Retractable truck steps will be your best friend then. Perfect for a truck like this as long as they tuck in properly so clearance isn't impacted