Is your tk a 1500?
In Daytona Beach, you might have a spring shop in town (or nearby). They do springs for large trucks but can also do pickups. If you wanted to have something installed by others, basically tell them what you're looking for and they ought to be able to fix you up with an overload type system. When I've had leaf springs done (and I know your tk probably doesn't have leaf springs), but in that case, they were quick and got me in/out in no time and the cost was reasonable. Another option might be a truck accessories place. A U-haul dealer too might be a resorce. Might be worth a phone call or three.
But if you don't mind installing yourself, definitely there are options. Just do a google search. I used regular air shocks on a vehicle (not 4th gen) in the past. They worked fine. That was an economical solution. I also used air shocks on the front of a truck in the past ...to help support a snow plow. It worked but the air shocks in that case didn't last all that long. But that was kind of case-specific.