CheapHeat furnace conversion

Like Harold, I would also like to eliminate a bunch of space heaters and use my on-board equipment. I don't particularly want to install baseboard heaters either. I can install a heat strip in the front air unit to help supplement what the electric furnace falls short of. I have 4 slides and am around 38' so not sure how well the furnace add-on will work but from what Harold describes it should do pretty well. Granted, the colder the outside temps the greater the probability I would have to use an additional space heater but I believe that would be on rare occasions. As for the fan mounted in the return grill for my furnace, a great idea but not sure it would work well with my camper because of the location. Return grates are located in the steps leading up to the bedroom and not really that close to the furnace. Furnace is mounted in the street side wall just aft of my convenience center and it's not a straight run of open space from the steps to it. Also seems like the fan would create a pretty good draft at floor level. I guess as stated before, my main goal is to utilize my factory onboard equipment with minimal additional heaters sitting around and the "Cheap Heat" is the only product that I've seen that remotely allows this while also supplying heat to the basement area as well. If there is another product out there that accomplishes this I would like to see it and compare the two.