Originally Posted by
FBinNY
If you want to insulate on a budget, you can scrounge or (gasp) buy bubble wrap packing material and wrap your cold stuff to keep it cold. If you want to do a super job, consider the EPS packing sheets, and cut and fit them to your trailer to insulate it.
Newspaper is also a great insulator, and sometimes more available than bubble wrap. I just wrap the cold stuff all together in 5 or 6 sheets, and stuff them into a backpack, mess. bag or whatever.