We carry a "Jigglin' George" exercise machine, also know as a Chi exercise machine. About the size of a small sewing machine (I also carry one of those) so it fits under the couch when not in use. You lay on the floor and place your ankles on the machine and it moves from side to side relaxing you clear up to the neck. Great for that tired, tight back and neck after a day of towing. They come in all price ranges, I got mine on Amazon for $80 and free shipping 7-8 years ago but they can be as high as $500. Great if you have slow leg circulation.
Check it out: http://www.amazon.com/s/?ie=UTF8&keywords=original+chi+machine&tag=googhydr-20&index=aps&hvadid=79095522192&hvpos=1t3&hvexid=&hvnetw=s&hvrand=13616276745351820705&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_50jm8enmpx_b: