This is a JLG T-350 battery powered self leveling lift on a trailer. Bought from Home Depot. needed a new hydraulic hose. I bought it for raising & servicing windmills, but the use as a tree trimming really took off. Flag poles fixed, weathervane & cupola installation, cleaning grape vines out of pine trees, hang holiday lights,... Lots of uses. You can remove the bucket and install a jib crane (made it myself). This trailer goes up 35'. A 50' version is also available worldwide. I like the battery version because you don't have to yell at the person on the ground over the engine exhaust sounds, added benefit by the battery chain saw I now use with it.
These lifts are made by several companies, some of which I rented before I bought the JLG. On the others, it might take 1/2 hour to level the darn things by yourself. On mine you hold the safety switch up and the leg extension lever up and it rocks & rolls for maybe 5 seconds until bubble level.
As for tree trimming, your 'ladder' is far away from your saw and you are generally positioned above the cut, so any bucking branches dropping down won't threaten your escape route. Be prepared for the neighborhood free rental requests for roofing, house painting, gutter repair, security light-bulb replacement at the malls,
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