After checking for the Los Ebanos ferry option, I is very tempting to go by the ferry!
There is a Youtube video (
) that shows it. Seem to me at lot more quiet than any other entry point...and it is only 2$ as per in the video and also only 37 Km extra. It crossed a small town on the mexican side and not the crowded city of Reynosa.
The only thing that bother me is the fence on street view just before US customs in the middle of the road (
https://www.google.com/maps/@26.2400...!7i3328!8i1664). Will see by myself when I get there.