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Been looking for one like that too, but they pull a premium price used or new here in NC. For a hobby trailer, they are just out of my reach. As I get older though a hydraulic tail makes loading and unloading a breeze. Nice find, I'm sure you are going to enjoy that for sure.
On the Delo/Rotella question, it's like religion and politics lol But I naturally have an anecdote! In 1978 I was fabricating a wet tank for my cousin's dump trailer,and we got into a discussion about motor oils.He asked what oil I used in my welding truck ( a c30 Chevy 350 ) I said Quaker State Deluxe.WTF are you putting that garbage in your engine for? He asked politely! He is a diesel mechanic and I think he also has an air frame license as well,so I respect his opinion on anything mechanical! He went into a 20 minute dissertation (fueled by several rolling rocks), on the virtues of Rotella T motor oil Cummins,Mack,Military,rated etc. He used to tune up all his neighbors cars,said several of them with sticking lifters and smoking exhaust(from short trips and low quality oil) were cured by one Rotella oil change! I've been using it ever since in all my vehicles and lawn equipment and have never had an engine failure.I use Castrol 0w20 in my wife's corrola because Rotella doesn't make it! In all fairness I think commercial fleets are equally divided between Rotella and Delo So my results may have been similar with Delo,I'm satisfied with rotella!
OD,GPS can be misleading! I followed a set of directions to a customer once,Got 300yds from his facility, and it's on the other side of a railroad track without a crossing!! The roadbeds 3 foot high! Had to drive miles to get to the place!
On the ignition switch issue on the fire truck, a sometimes fix is spray wd 40 into it will remove moisture and often dissolve residue.Works on big truck trailer plugs and marker lite connections too. Another product good for that application is the electrical cleaner they sell in computer stores.