The show is full of so many holes it plagues me but it's still fun to watch...
The RV was an 'ok' vehicle in the original setting at a campsite, but not the best on the open road... If I was in that situation I would be scouring all the 'military' establishments (plenty of Humvees to be found) they have been visiting looking to lay my hands on an armored personnel carrier(s)... Park that armored carrier and get a good nights sleep and if you are surrounded come morning put it in first gear and proceed forward

Might not be roomy but you will be snug and safe inside... Heck the bigger ones are amphibious as well, that could be handy...
Also in the last episode I just can't wrap my hands around caring a cross bow with a single bolt, while you complained that you wasted a bolt on a hanging zombie, cut that zombie down and reclaim the bolt, silly... Survival 101, don't waste your resources especially if they can be reclaimed...
Same with guns, I would focus on stockpiling all that I could at any opportunity...
And the biggest hole I have yet to see answered where and what are they doing, make a plan, something, just don't aimlessly wander... Can the zombies forge water, someone should have the answer? Even if they can it doesn't seem likely or practical they will... So bee line to the Gulf, grab a boat and head for an oil platform and setup a new home, most are self sustaining, for both power and water, seems like a win, win... Shouldn't take much of an offensive to rid the platform of any walking dead residents...