After reading thru the string, I would recommend:
Don't assume a nice paint job implies good mechanical condition. On mine, I had to do the following not long after I got it:
Change coolant, fan belt and new fan (blades had big chips), blow out radiator fins and screen.
Change crankcase oil & filter.
New koyker loader frame bolts were loose! (Mine has the subframe brackets and struts). I added lock tite and tightened and try to check them once in a while.
Changed front end diff lube. Then I noticed bad leak at big horizontal seals. I tore down front steering knuckles and found rusty upper steering bearings and pitted housing sealing surface. I cleaned up and replaced bearings and seals and still leaked with 90wt lube. I replaced with 140wt and still a little seep but holds lube level for several seasons. (You definitely need the exploded view dawgs for this and document disassembly order)
Voltage reg failed about a year after I got it. Replaced with hoye part.
Footboards were rusted out under rubber pads. I used as excuse to get blast cabinet and plasma cutter. Borrowed welder. Removed one footboard, cut out bad, blasted, welded in diamond plate section, painted and replaced. Other waiting on roundtuit.
Numerous other minor repairs over the years due to age (hydro hoses are $$$!) and occasional use (abuse) as a bulldozer!