Yes, propane/LPG does burn extremely cleanly, although with a bit less power. People I know that run it claim the engine oil comes out at 5000 or 6000 miles looking as clean as it went in. And, it doesn’t harm gaskets or seals.
Here in Oklahoma we have an abundance of LPG and many companies, school districts, and local governments have converted their vehicles to it. And no one I’ve talked to has had anything bad to say about it - except for the limited availability. I think I recently heard that there are 5 LPG filling stations in the greater Tulsa area, as opposed to at least 5 gasoline stations in the little town we live in of 7,000 people.
But if you have adequate filling stations there, then it would be a clean, green, and cheap fuel for your truck.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI