If you ever go back to the trolley, consider hooking the target up to a wheel in a reciprocating arrangement. That would turn the target into a bobber.
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Badass!
I realize this is an older thread, but its back up top and i just noticed it, and this looks like an awesome idea. Something to look at (if you decide to buy another unit) for easier portability would be a door opener with a battery backup. Mine has a 12vdc sealed lead acid battery as a backup that is good for a few openings during a power loss. No reason that battery couldn't be replaced with a larger one for all day use. It also has a built in charger to keep it topped off and uses a standard power cord for 120vac power. Got it on sale ~$175 at a big box store. There are also ones that use a power tool (ryobi, maybe?) battery for backup.
Thanks for these recommendations. Our garage has two lightweight aluminum doors, each with a 1/2-HP Craftsman opener, I believe from around 1995. Both openers have their share of problems & need to be replaced. So I reed recommendations what brand/model I should look for. Actually I’m not interested in any major door/opener remodels, just looking to replace these cheaply, but also don’t want junk that won’t last. These reviews help https://indoor2outdoor.com/liftmaster-vs-chamberlain/ but need some real life experience