Moto Head:
I highly recommend the EZ and 275's if all you are looking to do is tow. Fully loaded, my trailer weighs in at 9500 lbs. It pulls grades very well. It's not to hard on your clutch(although my stock clutch may differ... may it rest in pieces, er peace) as long as you don't try doing burnouts with a heavy load in tow. If you have ever driven between Nashville and Knoxville on I-40, there are some significant long grades, probably 2-4 percent'ers. I could run them all at 65 or 70, if I wanted to and did not have to get into the throttle. I didn't like some of the vibration I felt, but as it turned out that was my clutch getting ready to give up the ghost. I think my stock clutch started having problems the very first time I towed on a long trip which was 25K miles before I ever did mods. The mods just brought it to it's untimely demise a bit sooner. I did get 72K out of it, however. The combo you want is sweet and will serve you well. Anything more and you are getting into areas you may not want to be in while towing. Whichever way you go, you will have fun.