i work for an insurance company, so let me see if i can clarify some things.
insurance policies are set by your state's DOI-department of insurance, NOT individual insurance companies. all insurance policies are the same with each company....deductables, rates, endorsements can differ.
with an auto policy, you'll be able to get seperate endorsements for it, depending on which company you choose to go with. the company i work at has an endorsement called something like "auto customizing equipment-audio, visual"....i dont remember exactly what it is. (i work in towing and glass claims, so i dont handle that stuff.) i've studied over our policies b/c i'm gonna need one once i put the lift and new tires on my b2.
the first thing a company would do in a wreck is run an estimate on what you're truck is worth. with yours being a 1992, it's not gonna be worth more than $2k-$3k, regardless of what you have on it. the formula for figuring out a cars worth is ACV-depreciation=value where ACV=actual cash value. so on a 92, the depreciation would be significant. the program they use isnt kelly blue book either, it's usually a different program and i've found that it's usually a lot higher than what the blue book says. with most companies you can buy an endorsement that will pay you ACV if the vehicle is wrecked or totalled. it's more expensive though.
of course people are hesitant about insuring a lifted truck. there's much more risk on lifted vehicle. when you're front bumper comes up to the roof of a honda accord, even a low speed wreck can be deadly to the people in the honda. you wind up taking someone's head off or causing them to be paralyzed for life and the insurance company ends up paying hundreds of thousands of dollars in medical payments to them, if not millions.
you want to pay as little as possible and then get everything that you've put back into the truck if something happens and it just does not work that way. you get exactly what coverage you are paying for with insurance, no more, no less.
the more important thing than having UNINSURED motorist coverage is having UNDERinsured motorist coverage. lots of people out there have coverage, but A LOT dont have near enough.
bottom line, you want to insure your lifted truck and get close to what you put into it, you're gonna have to pay for it.