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@Impactjunky Thanks! Nothing's odd when you are hitting peds... except the fact that you are hitting peds. Just kidding, but yes, the impacts get somehow more violent hitting peds or vehicles.
The more curious part about attached props and collisions in this particular case is, like I said in the description, the fact that regardless of what vehicle you drive into the Storm Chaser, it doesn't move. And with some adjustments I made, it is rock solid, even with the Ramp Buggy, Phantom Wedge or the Rhino Tank.
And by the way, congrats on your mods. You have some very fine ones!

@jfavignano about not being able to get all the objects to spawn, I sometimes have the same problem, and it can be quite frustrating... especially after days of work. But I found out that it seems to be random: sometimes some objects don't spawn, then after restarting the game they do. Sorry for not being able to sort this out, even after searching I've never completely understood why this happens.
Just for the record, the objects that sometimes didn't spawn were the rear bumper "v_serv_metro_metaljunk3", and some of the monitors used inside the vehicle "v_serv_ct_monitor0x".

Thanks guys. I appreciate the feedback and I'm glad you liked it!