Everyone agrees that a 6v charger would be great, even in the original question otherwise he would not of said I do not have one.
I am just giving some knowledge on custom applications. Take it or leave it. I have literally taught classes on the subject, have over 20 years in the diesel field...
Series connecting different voltage batteries, not state if charge. Any combination of 2, 6, 8, 12, 16 volt batteries.
Remember that you only have one B+ and one B- so it is electrically one battery or X number of cells in series. In series one bad cell will take out the set even if you have...
If you put enough gear in it, but going that low with the smaller pinion you don't have as much tooth contact. If going through the effort of a axle swap I'd opt to go with a larger axle.
Hope you got it straightened out by now...
Definitely RF grounding. Under your mounting bracket you need to strip off some paint so the mount touches the rack. put a dab of grease at the contact point to keep it clean. Make sure the rack to body mounting is clean too. Its not so much that it as...
Batteries will charge and work in series even if they are different, but your set would only be good as your weakest cell. In series electrically it becomes one battery. You can even mix voltages. The amperage of your weakest battery is what the set becomes. Say there is one 900A@6V and one...
Another radio that would fit in here is a Kenwood TM-V71A. It could do UHF, VHF, MURS, marine, public safety, and they can receive to 1.2GHZ. They are so nice that I have a few and I like them way better than all of my Yaesu UHF/VHF radios. Most radios now will receive out of the amateur bands...
I'd either just get a heavier spring or take it off all together.
The NMO style mount itself won't help but you could use a bottom loaded antenna such as a Larson NMO-27C on it. Those are real lightweight. If is mounted below the roofline like it sounds performance may suffer a bit from the...