Mark and Mahu, Your views still come down to S_A contacting Quigley, Advanced and Nissan for supporting or conflicting data. S_A hasn’t done this so far.
quigley4x4.com has an excellent, easy to use site specific to Nissans. Go to Nissan Technical center. Weight chart, based on model year 2015, direct you to the engineering department if there are any questions.
If you google problems or issues with Quigley conversions, most posts are old and relevant to Ford E-series. Some issues involved using stock parts. One 2007 post indicated Sportsmobile West Quigley conversions were better, better turning diameter and more custom parts etc.
I didn't check Advanced.
Edited by radin2son, 13 October 2018 - 02:15 PM.