According to the directions, the capacity of the system is maximized in the mid range of the loader arms. If you can smoothly "slide" the load off the truck bed you will quickly get into this "meaty range" as you lower the load. You shouldn't have any problems but my only concern is the extension of the moment arm presented by the lift forks. Not sure whether the blower has a hard point on top but, if you have a sling, like the one I bought at Homey 'Po, you could just sling it off, pallet and all.
With my rototiller, I had the arms almost maxed up and 900 lbs was no big deal using the lift capacity alone without the bucket curl. And.. I was indoors, making an incredibly tight 90 degree turn.
Oh, and one final "don't do what I did..."
I was trying to pull a dead tree out of the ground by chaining it to the upper bucket lip and simply driving backward. What I didn't know was that is a great way to stand your tractor up on its front wheels. Its very smooth and deceptive and you'll miss it until your rears are a foot in the air. The worry is, if you get the CG high enough with the rears off the ground, the tractor can swivel like lightning and roll on its side. I am VERY aware of this happening now. I nailed the loader DOWN and planted my wheels back on the ground. Had I gone they other way, I might have rolled the tractor.
Back in the Spring, I was moving solid granite boulders that were right at the limits of my FEL. In one case, I was trying to lift this monster out of the ground, slung in nylon, not scrape the side walk I was straddling, and back through a maze of cacti, including a 20' high saguaro. The tractor was on a very slight slope to the right and just about the time I would lift the boulder, the uphill rear wheel would start to go airborne. With the previous tree removal fresh in my mind, I was always ready to slam the loader lever UP to unload the FEL. My wife was in the kitchen screaming at me thinking I didn't know my wheel was airborne. After she saw me gingerly try it a couple more times, she relaxed. I added a box scraper for weight and that helped me lift the load out and away successfully.
My concern with your load is as you lower it using the forks, your moment arm is at its longest right about the time you start to lower the load. Even with an implement on back, you may find the rears getting light. Be ready to get your load down as quick as you can. On a pallet, I doubt that full speed DOWN on the FEL would damage your load if you hit the ground. Better that than rolling your tractor. Just keep that in mind and be ready to unload if the rears get airborne.
Good luck.
Ray