Temporary trailer camper??

Hi everyone,
I'm not sure this is the right forum, or even the right site, but I guess it can't hurt to ask.
I have an existing 5x8 utility trailer that I would like to use as an occasional camper. I do not want another trailer that is only used for camping, and I need to be able to use this trailer for non-camping tasks.
I like the tent part of the Lifetime trailer tent, a lot. But as far as I can tell it doesn't come in a 5x8 size, and the tent isn't sold separate from the trailer anyway. The LittleGiant trailers are similar but they're smaller and again don't come without the trailer.
The Quicksilver TC1 is as close as I've found to what I'm looking that doesn't come with a trailer, but it's only 5x6 so it doesn't take advantage of the entire trailer; it's heavy as hell at 450 lbs so two people can't load/unload it from the trailer when it's not needed; and at around $4000 it's way more expensive than something like this needs to be.
I'm willing and able to create supports, modular side walls, or whatever else is needed... the part that has me stumped is the tent itself. The floorplan of the TC1 or Lifetime is what I'm aiming for, a rooftop tent just won't cut it. My first choice would be a pre-made tent along the lines of the Lifetime tent, with supports built by myself to fit my trailer. Second choice would be to modify a standard tent to fit the floor plan I'm trying for, but I would really rather avoid that.
So, any ideas? Has this been done before and detailed in a post here? I've searched as best I can but not found anything similar.
I'm not sure this is the right forum, or even the right site, but I guess it can't hurt to ask.

I have an existing 5x8 utility trailer that I would like to use as an occasional camper. I do not want another trailer that is only used for camping, and I need to be able to use this trailer for non-camping tasks.
I like the tent part of the Lifetime trailer tent, a lot. But as far as I can tell it doesn't come in a 5x8 size, and the tent isn't sold separate from the trailer anyway. The LittleGiant trailers are similar but they're smaller and again don't come without the trailer.
The Quicksilver TC1 is as close as I've found to what I'm looking that doesn't come with a trailer, but it's only 5x6 so it doesn't take advantage of the entire trailer; it's heavy as hell at 450 lbs so two people can't load/unload it from the trailer when it's not needed; and at around $4000 it's way more expensive than something like this needs to be.
I'm willing and able to create supports, modular side walls, or whatever else is needed... the part that has me stumped is the tent itself. The floorplan of the TC1 or Lifetime is what I'm aiming for, a rooftop tent just won't cut it. My first choice would be a pre-made tent along the lines of the Lifetime tent, with supports built by myself to fit my trailer. Second choice would be to modify a standard tent to fit the floor plan I'm trying for, but I would really rather avoid that.
So, any ideas? Has this been done before and detailed in a post here? I've searched as best I can but not found anything similar.