Bought for caribou hunting. - Rambo Bikes R35 FatTire Pedal Bike

I bought a pair of the pedal only bikes last winter with the intention of upgrading to a fat tire bike for hunting. I've used conventional mountain bikes with the 2" wide tires and though very happy with their performance I wanted to increase efficiency for traveling over rough and unimproved terrain which includes mud, sand, loose rocks to about 10" in size, tree roots, ruts, the works...
My wife and I use these bikes for a non-motorized access area to hunt caribou in Alaska. We tow home built trailers behind the bikes into the hunt area to carry camp in and out as well as the caribou we harvest. The bikes had their issues right from the start and though the problems were corrected by me quickly and the bikes worked okay.
Getting out in the field and riding them on the trail we very quickly began to realize they both had issues consistent between the two bikes. The brakes squeaked, the pedals squeaked, and with a little mud and sand now on the chain and derailleur, the derailleur would shift on it's own and without operation of the gear selector. Big problem! So, imagine pedaling away in a good pull in third gear and all of a sudden the rear gear cassette shifts to first gear. Instantly the pedal resistance disappears and our feet slip off the pedals. This only amounted to an annoyance to me but a safety concern for my wife as she would typically slip off her seat and land her legs on the bikes frame. She was bruised from her knees to her crotch on both legs. To add to this problem the folding pedals had a way of folding into transport position when a little mud gets on them and cakes in between the inner and outer portion of the pedal. They of course only fold down when the rider is in a hard pedal. Perfect timing for ones leg to scrape against the pedal after the foots slips off. At his point we're only a few miles into our trip and I've already made up my mind about these expensive bikes and we had only started with our problems. A round trip on our hunt will be about 35 miles in and out of the hunt area plus the traveling while there will easily get over 50 miles total. Not much for an improved road by comparison but there and with these bikes and their issues, it certainly slowed us down until the pedal on my bike actually came off. Yup. The pedal backed out a few turns and stripped the remaining treads from the end of the crank. That was so not awesome but being prepared with a few hand tools I was able to make a repair good enough to pedal the bike out of the field.
My wife and I have used a Trec and Specialized bike on previous (2) hunts with zero mechanical issues on any of the bikes and to add insult to injury the older bikes original new purchase price combined (3) were less than the cost of just one Rambo bike. The only positive aspect of these bikes to me is the 4" wide fat tire and the frame of the bike itself. I like the long wheel base (about 2"longer than my Specialized bike with 29" tires). The fat tire bikes did travel over loose dry sand very well though, as if riding on pavement in fact and a much nicer performance over the older bikes with the conventional size tires.
For next year's hunt I will certainly use the fat bikes and if I keep these two Rambo bikes I will for sure be upgrading the brake and drive train components with something of quality. More cost, mind you but the alternative is to sell the two at pennies on the dollar and start over with a more reputable bike.