I realized after writing this that my post pertains to 1st gen trucks in particular.
Rather than delete it I will post. It may contain useful info for someone.
I live in the rust belt, Florida Ma to be exact and in the winter they use 100% salt.
Keeping things in good operating condition is a challenge.
In my particular situation I would suggest keeping the original system with a few changes.
I had 3 steering issues on my 1990 W250 which is still going.
The first was the flex joint on the steering box wearing out twice (not to be confused with the rag joint) due to the poorly designed factory seal.
My fix was to purchase all new parts, body and internal slippers & pins and the optional boot that was available from Dodge. The new style boot is secured with 2 hose clamps which positively keeps dirt & water out.
Prior to installing the new body I drilled, tapped and installed a grease fitting in the very bottom of the body so I can fill it with grease. The other issue is the exposed shaft rusting between the steering box and the flex joint body which caused loss of all power steering fluid.
My fix required that I pull the shaft out, stone the surface and install 2 new seals. To prevent this from reoccurring I cut a donut from an old mud flap and installed it between the steering box and new body. I then pumped grease between the donut and steering box to prevent corrosion permanently. End of problems.
The Borgeson steering shaft is no doubt a superior design but it utilizes small u-joints which I feel are prone to failure due to rust. If I was to install an expensive Borgeson shaft I would find a boot to cover the u-joint to prevent exposure.
I have never heard of one of their shafts failing but if it did are the u-joint replaceable???
Note; if you ever need to remove the input shaft from the steering box it is critical that you know the procedure and use great care other wise you can loose 1 or more of the recirculating balls in the system which will cause extensive damage.
Tim