The Sherpa is an amazing vehicle, and for those of you who haven't seen it in person you should! It's a huge beast, but with the pop up design it's not really that tall when down. What is the exact height of it down Chris?
Also, just FYI, I recently added that same instant hw heater in my van and love it, but even though I blew out all my lines with compressed air (I never use the antifreeze stuff) it froze and busted on me. I'm going to try and patch it but just FYI if the Sherpa stays outside much you may want to make sure it's not holding water.