OK I've had a little experience with remotes over the years I've tried several types over the years, I ran several full threads about remotes and upgrading signal etc, Alex at gardiner can vouch for me and my knowledge, best advice is match areials to correct frequency and choice Wisley the antennas as it can really make a big difference, I've done backpacks with remotes to freedom trolly to van systems about 9 years ago, shame some of old forums don't exist anymore so years of threads like them are lost, but it's not rocket science, but you will need small stubby aerial on van east to make small hole an use tiger seal to waterproof it halfords do it aboutique 11 quid a tube but you'll find other uses for it like leaky gutters etc, here a link you'll need too,
https://www.rfsolutions.co.uk/antennas-c8 sorry old threads are gone but some will remember them, I still use remotes to this day, I hope this helps