Ironman Loadplus or Helper leaf springs?

Hi Fellow tsikot members. anyone already tried Ironman loadplus or any type of helper leafsprings?

my ride is Isuzu crosswind XTO and just wondering if it can help. i noticed that if i have 4 adult passenger, rear leafspring

is already 'sagad' or touches the rubber stopper, maybe an inch of play left. any advice to improve loading capacity of

my ride? im planning to replace my shock absorbers, still stock might be its time for replacement. ride is good when im alone

or with one passenger, not bouncy naman and not matagtag.

thank you