Following is a post I made to an Alto Facebook group. Reposting it here so I can find it again.

Last week my wife and I rented an F1743 from Durango RV Rentals and towed it about in our Tesla Model Y. Taylor did a great job orienting us to essentially a brand-new trailer, it had only been out once prior. We had a lovely vacation with perfect weather and spectacular scenery. Both trailer and tow vehicle performed well for the most part. Some observations and opinions TL;DR

Alto F1743

• Some minor but disappointing fit/finish problems: sliding doors that don’t stay closed because they’re too short for their enclosure and don’t adhere to the Velcro meant to hold them, drawers that don’t stay closed because the strike plate wasn’t screwed down tightly, a Victron battery monitor that read nonsense because it’s apparently wired incorrectly, and plastic trim around the coroplast that we watched detach itself while driving down the highway.
• After some worry about the strange readings from the Victron I located the EPEVER MPPT controller under the driver-side front bench and confirmed that the 12V system was doing well. Charging to 100% during the day, down to about 80% overnight, battery at about 13V when I looked. The entire week was bright sunshine but we camped four nights in the shade, all without shore power. The EPEVER display is great but not very useful buried under the bench, assuming we’ll be able to install a remote display.
• The Truma quietly and comfortably took the chill off the lower 40’s we experienced a couple of nights. Except for one morning around 7am when we awoke to an extremely loud (much louder than the water pump) warbling/grinding sound coming out of it. It was producing heat at low fan speed while making this noise. Turning the Truma off silenced it and after turning it back on it behaved normally the rest of the trip. Curious if anyone has experienced something like this.
• The Truma also nicely heated the water for a couple of quick showers taken outside.
• The SeeLevel tank readings seemed to stray pretty far from reality, not sure how useful they will be.
• The BFW is beautiful but definitely heats things up quickly in the sun. We’re thinking a MagneShade (at least) will be in order. With some creative seating (a cooler and a backpacking chair) four people managed to comfortably play Euchre under the BFW.
• Not a fan of the slide mechanism for the front dining table. Would probably replace that with the Lagun mount.
• In the natural sleeping position with head under the side window instead of the kitchen counter overhang, my wife likes to sit up and lean against the window to read. We’ll have to figure out some sort of pad or back rest that lets her do that without crushing the window shade.
• This trailer had a 12v compressor ‘fridge that worked well and froze ice easily overnight. This is encouraging as we plan to do this upgrade so that we can keep it running under tow via trailer battery (the Tesla doesn’t provide 12v at the 7-pin connector). You can hear the compressor running but it’s reasonably quiet. Way quieter than the water pump…
• The trailer included the extra table that mounts outside on the rail near the door. It was useful, we’ll probably include that option.
• Some other options we tested that we would order: Maxxfan, extra side portal window, standard portal door w/ sliding screen, bathroom sink, extra outside access door, driver-side outdoor light, lithium/solar.
• One option we would probably not order: bathroom window
• The trailer was loaded up with most options but not the caravan mover. That would have made getting situated in a couple of tight sites at Junction Creek campground (near Durango) much easier and would have allowed us to maximize the spectacular view at our Amphitheater campground campsite (near Ouray). We expect to order that option.

Tesla Model Y Long Range

• Instant torque at any speed makes EVs incredibly well suited for towing. It barely noticed the trailer going up or down hills. The road to Junction Creek had extreme washboarding; at times I was traveling at 1 MPH to avoid thrashing the trailer, without lugging the engine, burning the clutch, etc. The few times I needed to pass someone it was quick and easy even going up a steep hill. Controlling speed on downhills is as easy as modulating the accelerator. Or engaging Autopilot in a Tesla if you dare. No brake or down-shift required.
• Range while towing the trailer was considerably better than the 500 Wh/mi reference consumption I’ve been using in ABRP to model some trips. About 20% higher SOC than predicted after the trip over the Million Dollar Highway from Durango to Ouray. ABRP calibrated to 325 Wh/mi during the vacation but that seems way low, it would take a lot more towing to get an accurate number. But encouraging nonetheless.
• Our hitch just met the strict hitch height limitations imposed by Tesla. At about 18.5″ from ground to top of ball it’s on the low side of optimal for this trailer but it seemed reasonable. We used an in-car “wired” Tekonsha P3 brake controller that worked well.
• Durango is a strange desert for fast chargers. No Superchargers anywhere near and the few ChargePoint fast chargers, recently upgraded, have been up and down for months. This week they were down. Thankfully the similar ChargePoint chargers in Ouray and Purgatory ski area were up and there was a reliable but much slower EVgo alternative in Durango that got us on our way back home.
• The Tesla “phantom braking” phenomenon is real and real bad. Imagine traveling at 80 MPH in the middle of a clear day on well-marked interstate highways in perfect condition and having the car inexplicably decelerate so rapidly that your passenger is thrown into the seat belt hard enough to engage the retention mechanism. I presume this would continue to a stop in the middle of the highway but I override it before that happens. Trailer mode dampens this quite a bit but it’s still ridiculous. This happens when Autopilot is engaged, what non-disciples would call “Cruise Control”. That’s a little unfair, it’s really the equivalent of Adaptive Cruise Control, but since Tesla won’t demean itself by offering a feature as unsophisticated as a simple set speed, my $50K car effectively has no cruise control. This happened at least 10 times on this trip, a substantial improvement over the last big trip we took with the car. Don’t tailgate a Tesla.