I can highly reccomend the Itowbot by "tulsatowbots.com."  Unlike most towing devices one cannot excede the towing turn limits on the nosegear.  This also allows the airplane to pivot inside it's on wingspan with only a 6" clearance.

 

  They even have studded wheels for towing on ice.  I cannot recommend using differental braking in your IVP on ice, (been there, don't ask), also very hard on a painted hangar floor.

 

  I have a 2 1/2 inch rise over a 6 inch horizantal distance on my hangar entrance and it works well.  You may have seen the Itowbot at Sun-n-Fun or Airventure.

 

  Check it out on their website.

 

Jim Hankins ,  Lancair IVPT  150 hours