The detachable cord is for sure a current new camper thing. Both 30 amp and 50 amp campers. For a 50 amp setup, it is about all that is offered as the cord is so heavy, you can't stuff it in the hole. And that said, lifting a 25 foot, 50 amp, 4 wire, 220 Volt cord is "heavy". They split the 220 volt into 2, 110 circuits inside the camper.
I understand the critter issue. My neighbor does not use the foam insulation and the mice walk right in over the winter as he has the shore line cord plugged in all the time.
This detachable cord done with the proper setup, will work but one needs to weigh all the pros/cons. I toyed with the idea but gave up on it for me. I do use the pipe insulation foam with a Velcro wrap at each end, I can slide it to where it needs to be. A downside of the detachable cord, you always have to contend with all 25 feet, all the time even if you are 4 feet from the power post. It is not a show stopper, but you do have to store all 25 ft somewhere else.
Since we winter camper, I upgraded my original # 10 AWG, 25 ft plastic/vinyl shore line cord with a no. 8 Awg SOOW rubber cord. It was a drop off a roll at Home Depot and I could not pass up the price. Right guy, at the right place, at the right time.

And I made it as long as I could easily roll up in the hole. I have about 32 ft in the hole. The T310SR may have a bigger then average cord hole. The longer cord has less need for an additional extension cord and I can wind it up in the winter.
For insect critters, I spray ant spray on the cord and the ground a good 2 feet, on the cord above the ground hanging, all the way around and on the cord on the ground. That has halted the insects. I had ant issues once and that was enough to train me!
The 4 legged crawlers, I have not had that issue at camp or at home luckily. Seems the foam helps or they do not like the ant spray either. Not exactly sure why. While at home and when stored outside between camping trips at our old place, I use a battery minder plugged into the battery so the shore line cord stays stowed until we are ready to camp. Then I plug in if I need to cool the fridge down before we head out camping. This lessens the exposure of eating through the foam as the cord is not out there as much.
Each of us has to make our own call on this to what fits your area and your likes and dislikes.
John