There are several excellent choices, however, I recommend one that fits totally under the hood/nothing in the floorboard. Some friends have on that sits in the floorboard, and frequently comment on how it is a nuisance when they want to use the car. Keep in mind you really do get what you pay for.
Since I have a Diesel pusher and an M&G engineering auxiliary braking system
that uses air pressure from the MH when braking(can also be operated from a small compressor mounted under your gas MH), I'm not familiar with the various type 12v electric systems.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy