I'm going to order a "Lube Shuttle Hobby Greasing package" today and start testing. We have Ollie, 2 utility trailers, motorcycle trailer, and Ollie's TV with U joints to grease & maintain. Going with the standard narrow coupler and not a locking coupler to start with. Have one tough to get to universal joint grease fitting that's hard to get to with a locking coupler.
https://advancedenginetech.com/product/lube-shuttle-hobby_greasing_package/
Just got off the telephone with AET Systems that sells "Lube Shuttle" grease guns and grease in the US.
They have worked out an agreement with ACE hardware so Lube Shuttle products can be purchased starting 1st quarter of 2020 or no later than 2nd quarter of 2020. They're also talking with Tractor Supply and Home Depot, but cannot say if an agreement has been reached yet.
Something different from what we're accustomed to in the US, their grease coupling is metric M10X1 thread. Grease couplings in the US are 1/8NPT thread. If you replace the coupling, M10X1 threaded coupling will be needed.
Their G 200 EP grease (two tubes included with package) in the "Hobby Greasing Package" meets NLGI 2 spec. Dexter uses Lithoplex Red MP #2, also meets NLGI 2 spec.
Grease Dexter uses:
https://www.docs.citgo.com/msds_pi/C10198.pdf
Lube Shuttle G 200 EP grease:
https://advancedenginetech.com/product/airtec-g200-grease/
Here's an informative AET video: