I have a Viair 400 portable that I use for the MH and Jeep. Works just fine. I keep it in the back of the Jeep and, if I wish to do the MH, pull the toad around to whichever end of the MH I'm interested in, connect it to the battery and inflate away.
Dick
2002 43' DP Beaver Marquis Emerald Cat C-12 505 HP, 1600 Tq
2003 Jeep Grand Cherokee Overland ---toad