If the toad was insured in Texas, you have a SOL of 2 years to file a diminished value claim against your policy. Texas requires the insurance company to compensate you for diminish value as a matter of law. It's not what you think is right, what the insurance company says is right, what your neighbor thinks is right or what some stranger at the RV park thinks is right; the law says you get it, so you get it.
To prove diminished value and the proper amount is where things get a little bit of a problem. Just like the insurance company used smoke and mirrors to come up with some ridiculous reduce value of a vehicle in a total loss claim, you use their same smoke and mirror tactics to increase your diminished value and force them to pay. You will need to find comparable's that were not in any accident and compare their price (value) to those in a similar accident with damages. The difference is your diminished value.
Don't underestimate how much the insurance company will fight this as not paying diminished value is their gravy profits because so many people don't file these claims. So the insurance company assumes everyone is a fool and fights you hoping for you to give up. Of course, some will not care and simple figure how many people them scammed out of diminished value and pay you what you are entitled too simply because they made so much off those they ripped off by not paying.
1994 Itasca SunDancer 21RB - Chevy G-30 chassis.