air circulation in enclosed trailer

hey guys got a question for you. I have a 34' enclosed trailer that's fully insulated aside from the floor. when it cold out the heater doesn't keep up at all. I plan on insulating the floor and possibly adding a second heater at the rear which will help a ton but all the heat stays at the roof. the heaters don't circulate heat at all really. has anybody come up with a good way to circulate the heat? I don't want ducting ran all over the inside of the trailer. I was thinking a 12v ceiling fan but Id have to remove it all the time to load my rzr's. also though maybe just add a small 12/120v fan in the nose blowing rearward might be enough. anybody come up with something better? floor heat like the trails west units would be awesome. pictures of the trailer below:

unfortunately my rzr's come within about 1.5" of the roof so no ceiling fan will work lol

I think that's what I'll do. Mount one in the corner of the last cabinet and roof pointed down and back. Once I get the second heater installed in the rear I'll put another one pointed down and forward. The floor is getting spray foamed underneath also next days off so that and a second heater should help a tone right there.