Two questions..
What size tires are you running on the trailer..
And based especially on your latest problems with the actuators. If you started from beginning, how would you design your system? I love the overall usefulness of the design, having RTT and full use of trailer bed. So looking to gain from your experience of your work done so far, how I might replicate the idea.
Tires are 225/75 R16
I would design it from the start to use actuators, only I would find a weatherproof actuator up front. I likely would use the trailer tongue lift actuator like what I listed earlier in this thread, as they are weatherproof.
If I did not do that, I would consider gas struts, and try to figure out a way to lower it.
For me the scissor jack was more of a pain and extra weight then it was worth, it also took forever to put up. I like the convenience of the actuators as I can be setting up camp as it raises and I can control the height at which I set up the tent pretty easily.
I likely wont camp in the winter, but I wish I would have known they would be so finicky about the temperature as I could plan ahead and store the trailer in the barn with the platform already raised.