I have a 42' Bertram and regularly tow a 21' Contender from Lauderdale to the Exumas. I have a 30' nylon bridle attached to 150' of 1/2" Spectra, I keep the
outboard tilted about half way up where the skeg is just in the
water. I experimented with the angle a good bit until I found the "sweet spot". A reenforced towing eye is essential as is plenty of chafing
gear.
Towing a
tender makes for smaller
weather windows and slower speeds if the
weather kicks up.......but I have crossed the Gulf Stream in 3 to 4 foot seas at 15 knts with no problems when the seas flatten out I can run 20 knts or so. I estimate that I consume about 10% more fuel when I have the
tender.
I love having the
tender here in the Exumas but it definitely can mean longer waits for the right
weather window and it would foolish to take chances.