[87hilux7mge]

sounds like bad control arm bushings possibly.

knocking is usually associated with bad bushings, bad ball joint or bad bearings. all have different variations of "knock" sound.

youd hear a whirring sound at speed and a clicking at very low speeds if it was a bearing. if it was knocking, ud be in some smelly brown stuff (ask me how i know).

ball joints click and/or knock when turning or during suspension articulation, so its possible but if you already checked then ur fine.

bushings will present a heavy knocking noise, especially when compressing the suspension, depending on where the bushing has cracked.

ive had this happen a few times, and normally they arent hard to replace.

the other thing it may be is sway bar bushings so check them too.

if its the bushings, get a prothane front end bushing kit. itll stiffen up the front end nicely and last longer than oem.