We use ATM's for some cash but credit cards for most purchases and online banking to pay the credit cards. I never carry more than a couple hundred dollars in cash on me any time while traveling; certainly would never carry thousands in our rv.
This is exactly what we have done for many years. No problems ever...Costco ATM's are only $1.50....
$10-15 dollars in ATM fees is a lot cheaper than getting robbed, or loosing $9500...yikes!!
PS..You only need to pay C/C balance in full, once per month before due date sbown on statement (which can be viewed in online banking) to avoid any interest charges for purchases made. However, if you draw cash on your C/C then that will incur interest charges immediately until it is paid down.