motor design?

Hello,

I'm trying to design a wireless system to drive a motor using the vehicles 12vdc power source. I am finding plenty of transmitter / receiver units of interest to our design, but I'm having a couple of problems which need to be worked out prior to ordering.

First of all, our motor is reversible, by switching polarity to the 2 leads. I am assuming a DPDT relay should do the job, but is there another way to go about the connection? I would like to have a 2 button remote to power the motor in each respective direction. Is there any way to use 2 relays to achieve this goal?

I will need relays and boards capable of withstanding 15Amps, so it is likely that 20A relays would be perfect. Do you guys have any recommended receiver boards built with the correct relay setup for this application?

Lastly, can I utilize pac-audio's TR-4 for a 1 second time delay between forward / reverse operation, to reduce stress on the motor? Is there a more preferrable unit?

Thanks for the help

They certainly don't have much information posted on that device, especially for $85.

So far I've found Tx / Rx systems that are close to our application for around $25 for the set, I'm simply having a problem with the relay wiring for the motor