I bought some Rancho 9000 in May. I found a supplier on the internet that had them for $297 for the set of 4.  Rancho had a $100 rebate. So my net cost was just over $200 with shipping. That's $50 a shock for a shock with a lifetime warranty and some great features.  Rancho periodically offers the rebates. Just keep an eye on their sales promotions.

Also look at the Bilistien 5100. They are a great product.

Bilstein, Monroe and others, make a good replacement product for your truck. Stay away from the larger off the road variants, if most of your travels are limited to open highways. If your truck doesn't squat excessively when the trailer is hitched up, you don't need air shocks, a compressor, air lines, limit switches, etc.

Purchase the best HD OEM replacement shocks for your street use. If you do any serious amount of off the road travels, there are numerous specialty companies, that can outfit your truck with appropriate after market equipment.

Many manufacturers offer life time replacements, a valuable offer, when you consider many shocks will not make it to the half century mark.