We also tried a Rayzr FK (full kitchen model) in an effort to find something that would allow us to cook and eat out of the elements while we slept and entertained ourselves in our Range Runner pull behind. The Rayzr was advertised at (from memory) about 875 lbs. The CAT Scale showed it to be closer to 1200 lbs. It uses a window mount 5,000 BTU A/C high up on one wall. Running the A/C all day made me curious where all the condensate water was going as not a drop was visible outside the camper. I called Travel Lite to ask them about it and they said that there is a pan beneath the unit to collect the condensate. So I asked him then, "so where does this water go" ? He replied that it just evaporates ! If you can't see this pan, how do you know it's evaporating or simply running down between the inner and outer walls. The salesman told me that they haven't seen any damage caused by the system .... this was after they had been on the market less than 6 months and sold only a handful. I didn't trust their logic. Secondly, we had this installed on a Ram 1500 with the 3.6L Pentastar engine. Previously we pulled a 3500 lb travel trailer coast to coast (8000 miles) averaging 14.2 mpg. With the blunt front on the Rayzr we averaged 12.8 mpg at best. We sold it back to the dealer taking a loss on that experiment. There are videos on our channel showing some of the modifications I had made to both the 770R and the Rayzr FK (all for nothing). The story has a happy ending as it forced us to get a 3/4 ton and a real TC. Finished a 9,500 trip to northern BC from Georgia this spring with our new unit without a single hic-up :-) The lessons we learn :-)