Interesting on the 27 foot rule... where did this come from, is it specific, or just determined by folks here to be the safest setup?
There is no real engineering rule that I have seen. A few years ago, the RV industry put some rule out there. I think (don’t quote me) that is was like for the first 100-110 inch wheel base can support a 20’ trailer and then an additional foot of trailer for each additional 3-4 inches of wheel base. Again, trying to remember from memory and I don’t feel like looking it up (just stopped in to take a break from work).
However, there are other factors that really need to be taken into consideration like the distance of rear axle to hitch, TV stance (height:width ratio), tires, etc. that may have a greater impact on the performance of the handling of a trailer.
Personally, I think a 25 foot with a SWB and 27 with a Max/EL Expedition is pushing its limits. Granted, my next trailer will be a 25’ one being towed by a SWB Expy. However, that is what I feel comfortable towing. I take it slow and/or pull off is the conditions get bad. I would rather piss off a bunch of people behind me than die or kill someone. That is my opinion and how I handle situations when driving.
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