Maybe you could just do as you said here and just ad better front and rear suspension. That is a nice model you have there to start with. I am sure it will turn out very nice when it is done, as all of yours are.
If he has papers on his dogs he does not want this reported. I have been told they are keeping better track of the health records of the family of dogs, that is everything.
As others have said report him.
Joe go ahead and sell it while you think you want to. If you talk yourself into keeping it you will kick yourself later. Unless you have free storage because they longer it sits the more will go wrong with it.
There are more then one nice SUV'S you could replace it with.
The Ford monster trucks form AMT had 3 inch tall tires. The MPC Bronco monster truck had 2 3/8 inch tall tires. Good luck fining one cheap enough to just take the tires off of.
You might want to check out one of these. https://www.ebay.com/itm/NEW-Revell-MONSTER-JAM-MAX-D-MAXIMUM-DESTRUCTION-MODEL-KIT-SNAP-TITE
I was the last of 4 boys along with 7 sisters. The majority of my toys were hand me downs form all over. I played with them so they are all gone for the most part. Some Tonka toys are still at dads house. I just hope one of my sisters don't find them and plant flowers in them.
Back in the day, dealers would do many things to get you to buy their trucks, and cars. I would say it is more than likely an option checked when ordered.