I have one of those adapters. What it does is move the ball farther away from the receiver and decreases it's capacity and increases the load on it. I no longer use it. I've found that bikes will bounce on the rear of a trailer so any rack has to be very sturdy. Had one of my racks bend and know of two that broke off. I have had success with a rear rack after I built my own. This subject has come up several times so a search should result in plenty of info. Don't block visibility of the tail lights.
But, this will increase your tongue weight significantly. What is it right now?
Our friends borrowed our scamp and used their bike rack in our Scamp's hitch, against our advice. He is an experienced tower and he said there was a LOT of sway with the bikes back there, to where he was going real slow on the highway and was still uncomfortable. He was towing with a Suburban.
And yes, he now knows for certain that he is not to do that with our trailer again!
The other option is to get folding bikes. There are a wide variety of options, and it might not cost much more than outfitting your rig with something if you can find them used. Sure would cost less than a bad accident caused by towing with bikes on the back of the trailer.
I have wider Yakima crossbars that I use on our Outback that also switch to the truck. I can carry our fairly wide canoe on it, plus I found a swagman carrier pair that fits on the crossbar. With the wider rack, I can carry the canoe and 2 bikes on top.
This setup has worked well for us, used it on a trip from GA to Acadia and Canada and back, and it's in use on our current trip to FL. YAKIMA and Thule both make racks that allow carrying kayaks on their sides, which might give you enough room with your current crossbars.
John-Dave and Marilyn
04 Dodge Dakota V-8, 17 Dodge Durango V-6, 19 Ford Ranger 2.3 Ecoboost
Trailer: 13 ft 2005 Scamp Deluxe; 2002 Subaru V6 Outback
Bike Rack for Scamp 13
Thanks all for your feedback, especially the hazards of a dual tow apparatus. I now have lots of options. I did see a Scamp 13 with a bike rack welded to the back of a trailer at a rest stop which prompted my question.
The interior length of 13' Scamp is 10'. The only way to fit 10' kayak inside is to break it in half.
You can put a 5' pipe in a 3'X4' box. You just have to go from corner to corner... I believe Pythagoras was the guy's name... <_<
Using his theorem (10 X 10) + (6 x 6)= 136 sqrt= 11.66'... so if you could
angle it past the doorway you could get an 11 foot kayak in a 13' scamp...at least in theory, My question is, has anybody done it?