an old Suburban or Tahoe, somewhat OK on gas mileage, lots of acreage for antenna farms, good groundplane,lots of room for spare batteries,mounting equipment,etc
Crown Vic - Hate to say it... same deal, lots of acreage for an antenna farm, the police interceptors have higher output alternators if you're gonna go HF mobile with amps, better on gas mileage, up to 29 MPG highway if you get a car with 2.73 RAR and don't dog it...easy to maintain, parts are cheap if it needs to be fixed...and the vehicles themselves are pretty inexpensive.... I purchased a '98 with 52K miles in exc. mechanical condition for 1700$