Originally Posted by LBaranyai
My husband has towed our 17' Escape with a motorbike on back...
... most importantly, his enduro motor bike is small - it's only about 180 pounds. For our tow vehicle, it works out great.
In addition to the moderate bike weight (compared to other motorcycles), this is the ideal Escape model (other than the 5.0) for this load configuration.
The proportion of trailer length behind the axle versus in front of it is lower for the 17 than other models, so the length of lever arm for the mass of the bike to lift the tongue and make the trailer sway is low, compared to the length of lever arm to the coupler for the tug to support and control the trailer. This is why the 17 has the battery on the bumper rather than the tongue - for balance in what otherwise be an excessively tongue-heavy configuration. In this case, it's the 17B which is presumably more front-heavy to start with than the 17A.
For example using guesses for dimensions, if the distance from bike centre to axle is six feet, and it is 12 feet from axle to coupler, the 180 pound bike will reduce the tongue weight by 90 pounds. That's significant, but with an Escape15 the distances might be 6 feet and 10 feet (rear 60% of front) and that would mean 108 pounds off the tongue.
For tandem-axle trailers (the 19, the 21, and soon the new 5.0) the effective axle location is midway between the wheel centres. Visually, the tail of a 19 or 21 doesn't look so long, but it is not just the body behind the wheel opening that matters.
An additional factor in is that all Escape models use the same size steel tubing for the raised rear frame section (under the dinette floor), so there will be fewer bending issues if that section is shorter. The 17 appears to be as short as the 15, the 21 looks longer, and I'm not sure about the 19.